What is Open Hack Day? It’s what happens when clever web developers, a wireless connection, a host of web services, and massive quantities of caffeine, pizza and donuts come together for an all-night code-a-thon. After 24 hours, creative coders show off their mashup wares and clever apps, American Idol-style, before a panel of distinguished judges, who bestow awards, praise, and lots of geek cred.

Ever since the first Open Hack Day back in 2006, we’ve made it a priority to be as open and accessible to developers as possible. Yahoo!’s audience is global – and so is the base of developers who value our open tools,technologies and vast user base. We’ve hosted Open Hack Days in the U.K., India, Brazil, and Taiwan; next month, we’ll meet with developers, designers, and entrepreneurs from New York’s vibrant Web technology and digital media scene.

We’ll kick off the weekend with a Friday morning keynote from Internet guru and NYU professor Clay Shirky. That’s followed by a full day of tech talks, panel conversations, and hands-on workshops that cover the latest Yahoo! developer tools and services. Yahoo!’s open platforms let developers build things that anyone can use on and off Yahoo!: Flickr toys, Connected TV Widgets, and open apps that you can install for Yahoo! Mail, My Yahoo!, and more. On Friday evening, we’ll kick off the hack contest and hold our breath to see what’s built by Saturday afternoon. And in-between, we’ll host a special Open Hack edition of Ignite NYC — a geek’s open mic.

What will take this year’s prize? A moblogging purse, a phenomenal way to share and organize your photos in Yahoo! Mail, an iPhone orchestra, or something we haven’t even thought of yet?

To get a better sense of the Open Hack Day showdown, check out Ricky Montalvo’s “Hackumentary,” a short film documentary shot during last year’s event in Sunnyvale. Here’s the trailer:

Hack Day – a hackumentary short film from ricky montalvo on Vimeo.

Head over to http://www.icanhaz.com/yahoohacknyc to register, check out the wiki, or follow us (@ydn) on Twitter for updates. Let the countdown to Open Hack Day 2009 begin!

Chris Yeh
Head of the Yahoo! Developer Network

We were blown away by amazing ideas and hacks. After 24-hours of working through the night on new creations, our hacker guests demoed more than 45 hacks to our panel of judges –- internal: David Filo (Chief Yahoo!), Ash Patel (EVP, Audience Products Division), Cheryl Ainoa (VP, Media Engineering); and external: Matt Mullenweg (Automattic/WordPress), Om Malik (GigaOm), Rashmi Sinha (SlideShare) and Jeff Clavier (SoftTech VC).

We saw some comedy, some shtick, and some basic crowd appeal, but the overall winner was truly a hack that will enhance a user’s experience on Yahoo!, taking advantage of the sneak preview of the Open Mail Development Platform that was in effect for the weekend. A few developers from Xoopit created a Yahoo! Mail application that enables users to more easily share multimedia within their inboxes.

Prizes were also awarded in other categories, including some that were invented on the spot by impressed judges. These ranged from Best Technical Hack (officially called “Filo’s Technical Merit”) to Best User Experience to Most Prolific to the Bleeding Purple Award, which went to the team that used an incredible number of Yahoo! services to power their hack. Om even created the GigaOm award – an invitation to the upcoming Mobilize conference – given to the creators of “Where are My Drivers?”, an application for small business owners to track location and communicate with their delivery vehicles. The full list of winners can be found here.

It was a blast to meet hackers from around the world and talk tech, get creative and code until our eyelids drooped. We had developers join us not just from Silicon Valley, but from Brazil, Canada, England, India, Israel, Korea, Spain, and Taiwan as well. Three hackers even won a contest to come from Malaysia, the Philippines and Singapore to show their stuff.

And that’s just a taste of the buzz out there. If you’ve got time to kill, search for #hackday on Twitter or “openhack08” on Flickr – you’ll find a bonanza of more than 2000 photos and 400 tweets. Here’s a sampling of what people were twittering:

• #hackday was excellent.
• #hackday was awesome!!
• Had an awesome time at #hackday. Ate, danced, drank, met and talked to some awesomely smart people. Girl talk ROCKED.
• Totally enjoyed the reunion aspect of #hackday.
• This #hackday is off da hook.
• My cup runneth over of yahoo technologies #hackday.

The next Open Hack kicks off in Taiwan later this week – stay tuned to developer.yahoo.com for an Open Hack coming to a city or country near you!

Chris Yeh
Head of the Yahoo! Developer Network