This coming Saturday and Sunday, Aviary and General Assembly are hosting the second installment of their baller photo hackathon, often touted as "the world's largest photo hack day," though we're not sure there's that much competition. At last year's event more than 175 developers produced 40+ hacks, a number of which were built using Face.com's futuristic facial recognition technology.

More than  200 developers have already signed up for the second go-round, officially known as Photo Hack Day 2 (Twitter hashtag #PHD2), so you can expect even more hacked-together photo goodness. Like Aviary's photo editing suite itself, the emphasis now is on mobile development rather than the web. "Sunday demo tickets completely sold out a full week and a half before the event, so we’re anticipating a good, curious crowd," said Alex Taub, Aviary's head of business development and partnerships.

Aviary and GA have already announced an impressive roster of speakers for a fireside chat moderated by Aviary CEO Avi Muchnick, including Tumblr's David Karp, Reddit cofounder Alexis Ohanian, and Cheezburger CEO Ben Huh. But today they're ready to talk about the good stuff: prize$$$.

There will be $10,000 up for grabs in prize money, spread out across 1st, 2nd, 3rd place, plus People’s Choice. Nokia, the hackathon's headline sponsor, will also be offering up  eight Lumia 800s for the top two hacks on Windows phones, which will also  receive marketing support when the apps are published in the Microsoft Marketplace.  Hackers can expect a number of other goodies as well, including: an Xbox and Kinect, a dSLR, a Lytro camera, a GoPro camera, an iPad 2, and a Blackberry Playbook.

But the biggest reveal may be an unexpected global perspective. The coders at General Assembly will be simultaneously hacking with another photo hack day happening in Berlin (the first such event in Europe). Both hackathons will be livestreamed for mutual, real-time exposure. Aviary and GA are also facilitating cross-pollination of fireside chats; Berlin's is a Q&A with Twitter. Looking to stretch your hackathon legs even farther? Aviary is working with Skylines, an Amsterdam-based photo startup, to bring the first Photo Hack Day to Amsterdam after SXSW. We would like to perpetuate stereotypes by wondering if that means you're allowed to show up high.