Difficulty of integration, innovation of the project, best use of products (such as eBay) and the usefulness of the hack
First place winner from Geogria Tech was: kinect / video hack for in-video product placements and purchases
Second place winner from Georgia Tech: Chrome extension to search for eBay products from raw images
Third place winner from Georgia Tech: eBay product based Price is Right guessing game
Makerbot hack: They took a piece of toast and loaded the syringe with peanut butter, then the machine would print a picture on the toastCake hack: They tied LED lights in the form of faces on the cake. They were controlled by a program that would look at a link saved to Delicious and determine whether the site content was happy, sad, neutral or angry, then light up the appropriate face.
Katamari browser hack: http://kathack.com/ - basically allows you to create a Katamari ball on a webpage and start picking up content on the page itself.
Use any tools available to you – jQuery, libraries, frameworks, anything to give you a leg up
Bad stuff happens – the last hour before the hackathon ends usually causes the most problems
Don’t wait until the end of the night to work on the tough problems – it’ll take you longer and be more difficult due to sleep deprivation
Introduce the team that can help throughout the hackathon