Best Hack of the rules : Blue Steel, Beagle III
Should have been in the product yesterday on Yahoo!: Stephen Fernandez, Indicating Users in Flickr Photos with tags and notes (greasemonkey)
Should have been in the product yesterday on BBC: Dharmafly, Hack Hud
Best use of BBC API’s: Monkey Tennis, BBC Nwsr 24
Best use of Yahoo! API’s: Steffan Jones, Flickr Tunes
Most Useful: Richard Rutter & Andy Hume, "Get us Organised"
Best International Hack: Mnemosyne, You say potato, I say Solanum tuberosum (greasemonkey)
Funniest Hack: North and South, Top Gun
Best Overall: Nick Bilton and Michael Young, shifd.com
There were also a few special category winners presented by the Hack Day sponsors:
Make Magazine: Bli.mp
SecondLife: Supernova, SLorpedo: The mixed reality game of naval warfare
Flickr: Steffan Jones, Flickr Tunes (also "Best use of Yahoo! API’s". see above.)
BBC Radio: Erin & Kelvin, John Peeled
Christian Heilmann posted the complete list of submitted hacks, and Frankie Roberto liveblogged the demos.