Perhaps shuffle the Website Idea Generator http://blogoscoped.com/ideas/ or pick a cell from the Technology Mashup Matrix http://blogoscoped.com/matrix/ , or look up a random word in dictionary on the day, then brainstorm what app could come out of it. - Philipp Lenssen

I love http://blogoscoped.com/ideas/. - DeWitt Clinton

This might be a little circular, but how about a webapp to help setup and manage a 24hr (or weekend) app challenge? you could have team registration, linking in repositories to track that deadlines are met and to track progress, a central place to distribute the app for judging, team pages where you can showcase your past challenges and how you did. - John Duff

Easy(ish?) one: site that takes your iTunesLibrary.xml file, processes it, then spits out pretty graphs about most/least listened to genre, song, and whatever other states you can get our of that file. Bonus points for easy sharing with others (widget to smack on a site). Bingo bonus if you can create an app that will upload the iTunesLibrary.xml file periodically to the site. - EricaJoy

Hey I'm cool with XML. Formatting the iTunes file for the web is a good idea. - Roberto Bonini

Using the Friendfeed API, write an app that allows one to mass-delete one's own Friendfeed comments which are older than 1 month (or so), to help clean up the digital trail. - Philipp Lenssen

What about an Android FriendFeed client? - Vadim Spivak

@Vadim - I started toying around with writing a Android client for FF, definitely viable, but not in 24 hours. : ) That said, I'd be happy to drop my other project to code with some other people on that tomorrow. - DeWitt Clinton

Good point :) I was thinking something simple to start off with.. post feature with camera integration/geolocation. Maybe do something with the realtime API? - Vadim Spivak

Create an app/site that will pair up people who can't drive to their polling place with the people who are willing to drive them. Add in some Google maps magic to show where the real need is. Also add some feature so drivers can pick up more than one person at a time. - EricaJoy

I would love an app that made internet pundits accountable. You'd enter a quote, a link and a date in the future. Then it would email you at that date in the future so that you could verify if the pundit's prediction had come true. - Adewale Oshineye

Ade, was that comment related to this, perchance? http://www.pbs.org/cringel... - DeWitt Clinton

Actually it was triggered by a combination of Patrick Collison's post: http://collison.ie/blog... and Greg Linden's predictions from January: http://glinden.blogspot.com/2008... - Adewale Oshineye

Now that I think about you could generate a lot more usage if the app simply showed the predictions that were due for today and let you see which predictions would be due on any given date. - Adewale Oshineye