Yesterday AOL and TopCoder announced the Web AIM Mashup Competition, with more here in the press release. They are offering prizes up to $5,000 to a developer who creates the best mashups built on their new OpenAIM initiative. The contest window is short and entries are due by December 6th. See also our /contests page.
AOL has been making a notable push in the open API space this year and is gaining some traction: 50,000 developers have registered for Open AIM. Their main developer home page is the recently revamped and much improved dev.aol.com and their AIM-specific developer site is developer.aim.com.
You can find 10 AOL APIs at ProgrammableWeb including some you may not have realized they have.