A simple little site I built a while back called DailyMashup (dailymashup.com) received Honorable Mention in the Web 2.0 Awards (web2.0awards.org) put on by SEOMoz. I didn't find out about the awards until they emailed me today, so I'm not really sure how big they were.
If your not familiar with the daily mashup, it uses a few API's to put together a page showing what's popular for the day.