Google held a session today at I/O 2013 about how to make money on Android, and in the initial few minutes it shared some updated stats around Google Play revenues and how those are progressing. Not surprisingly, the big growth is coming with in-app purchases, though Google’s recently launched subscription model is also making headway.

Google said that its in-app revenues through Play are up 700 percent since the same time last year, which is reflected in the top apps as listed by highest grossing titles in the Play rankings. Subscriptions, which just launched around 12 months ago, is also making headway, doubling inbound revenue each quarter according to Google. Some apps which use subscription as their exclusive revenue model are now cracking the top grossing list, like Pandora.

The momentum is still clearly behind in-app purchase, and as a result Google suggested that there’s good reason to consider that as a revenue model when building apps. Session host and Google Play Product Manger for Commerce and Monetization Ibrahim Elbouchikhi said that while the team likes to play a game called “Where’s Minecraft?” where they spot the world simulation sim from Notch, which continues to sit high on the charts despite being a one-time purchase paid app, the trend is overwhelmingly favoring freemium experiences.

Native Client – a technology that allows developers to run native compiled C and C++ code as part of their web apps – has long been a part of Google Chrome. Even though other browser vendors haven’t adopted it yet, Google is clearly putting quite a few resources behind this technology and at I/O this year, it announced Portable Native Client (or PNaCl, which Google says we should pronounce as “pinnacle”). PNaCl is now available in developer preview in Chrome 29 and will slowly find its way into the stable version over the coming months.

PNaCl, the company says, will allow developers to write web applications “that are truly architecture-independent.” It’s essentially an architecture-independent version Native Client, so unlike now, developers can write their apps and know that they will run on ARM and X86 (both 32-bit and 64-bit). PNaCl, the team says, uses an LLVM compiler infrastructure with a “compile -> link -> translate” workflow that creates an intermediary bitcode, which is then translated locally for the specific infrastructure.

That’s some pretty complicated stuff, but essentially it will allow developers to write high-performance apps that offer near-native speeds for today’s existing platforms and they can be sure that these apps will also run on new architectures as they become available without having to rebuild their apps (assuming, of course, that Google will continue to support this product).

It sounds like a nice idea, if you don’t own a calculator. The governor of Wisconsin wants to give his residents a tax break, using the revenue from a proposed Internet Sales tax to lower the state’s income tax. “I want to make clear, should federal Marketplace legislation become law, my intention would be for any resulting additional revenue be used to provide individual income tax relief for Wisconsin’s taxpayers,” Wrote Governor Scott Walker to members of Congress.

The Marketplace Fairness Act will permit state governments to collect sales taxes from any business that both grosses more than $1M in revenue and has a substantial operating base in their region. Earlier this month, a draft of the bill passed the U.S. Senate with overwhelming bipartisan support, but faces tougher opposition in the House, where Republican leadership is concerned that the law will be a logistical nightmare for small businesses.

Although, I wouldn’t get too excited. With 5 million residents in Wisconsin and an estimated $95M in savings, that’s about $16/per person, assuming it would be distributed evenly. If Forrester’s research is any indication, the sales tax would cost the average American roughly $167 per year, so it’s a net loss. If it’s unevenly distributed, a few already wealthy people will be slightly wealthier.

Now that Defense Distributed is on the defensive, it’s time to think a bit harder about what 3D printing really means. To that end, Michigan Tech is sponsoring a Printers For Peace contest that is encouraging designers and engineers to make amazing stuff using a 3D printer that can change the world for the better. “Unfortunately, the only thing many people know about 3D printing is that it can be used to make guns,” writes Dr. Joshua Pearce, founder of the project.

“This is an open-ended contest, but if you’d like some ideas, ask yourself what Mother Theresa, Martin Luther King, or Gandhi would make if they’d had access to 3D printing.”

The deadline for the contest is September 1st and they’ll announce winners on the 4th. They are looking for designers to build things that will help, not harm, people.

“The tech industry is, frankly, being greedy. They are going back and asking for changes to language they helped write and blatantly trying to roll back requirements that give high-skilled American workers a fair shot at getting a job,” said AFL-CIO legislative Representative Andrea Zuniga DiBitetto about new proposals to ease the hiring of high-skilled foreign workers.

Facebook founder Mark Zuckerberg reportedly called Senator Orin Hatch to push more tech-friendly changes to the comprehensive immigration reform bill. Among Hatch’s most contentious suggestions is an end to a 90-day wait period before companies can solicit applicants with a foreign work visa. According to Reuters, under Hatch’s amendment, employers would only have to make a good-faith effort to hire Americans.

While, conceptually, comprehensive immigration reform has strong bi-partisan support, its passage is far from certain. Reuters could not report whether unions would support the bill, should Hatch’s changes go through.

I like little notebooks. I need a place for my introspective musings. Moleskine notebooks are fine. But now there’s DODOnotes, a clever little notebook *slash* iPhone holder that could soon earn a place in my pocket.

This contraption is from DODOcase, the same San Francisco-based startup that created the make-a-tablet-look-like-a-book craze. DODOnotes costs $13.95 and is available for both the iPhone 5 and iPhone 4. Sorry, Galaxy S owners; DODOcase doesn’t want your money.

This isn’t a case, per se. DODOnotes is more of an open sleeve. A colorful elastic band holds a naked iPhone into a slight frame. Yeah, that band prevents the owner from, well, playing Dots while it’s held in place, but answering the phone or glancing at notifications is totally possible. But for most actions, the phone needs to be removed. The case is available in red, black or blue.

The first rule of being cool is not telling people you want to be cool. Yahoo is not following this rule, with its M&A team in full pray-and-spray acquisition mode post-Marissa Mayer hire, hitting on everything that walks, or at least has traction.

I’ve heard rumors that Yahoo was trying to get into the following deals over the past couple of months: Foursquare (at an $800 million asking price). Path (at a $2 billion asking price). Pinterest. Hulu. Zynga. Daily Motion. And at a smaller scale: Gdgt. Wavii. Media Ocean (?). A spate of others. And now Tumblr. “Literally they talk to everyone,” said one person familiar with the matter on the matter.

There was a kid in my high school who used to buy the popular kids lunch so he could sit with them. Yahoo has become that kid. At a reported $1b Tumblr would be a pricey picnic, about 1/4 of the cash Yahoo has on hand.