Need some Ideas (not abt making money)

Hey,

i am going to participate in an event and i need to make something new and innovative, like using available API's from google, yahoo and other services and in any language (i'll be using php/html/css/mysql)

so if you guys can brainstorm for me and help me out with an idea.

its not supposed to be blackhat, but something useful.

thanks a lot.

Go for facebook API
Learn and earn both
Its easy
for more
refer developers.facebook.com

Hook the Groupon API to the Google Maps API

Find some way to lure traffic and offer coupons to users

make money

new movies: hey thanks for that, but i wanted more of a "What should i build" instead of "what should i use".

tony-raymondo: thanks for that idea man, i will look into it, it really looks a good option.

more ideas welcome

thanks

PS: it is not necessary to be a money making idea, just need something useful and creative

Edit: i know PHP/mysql/javascript/html/xml/jquery/ajax/CSS/.net and can work with any API's, so thats really not a problem. its the idea that i am missing.

http://earth-api-samples.googlecode.com/svn/trunk/demos/milktruck/index.html

have people drive around "looking for deals"