AOL is also releasing Boxely (coming August 2006), which is a toolset of UI elements similar to Yahoo!'s UI library (how does one include both a bang and an apostrophe in a possesive noun with punctuation like Yahoo!?)
It's not clear yet what AOL really has to leverage in terms of bringing in mashup developers. Really someone that wants to get hired/bought. Though being able to better integrate AIM status and location into a site/tool seems really useful. So go to developer.aol.com and see if anything sparks your imagination. And try not to smirk at AOL's line:
...this is where you'll find the special sauce to build great Web applications. We want you to hack our stuff. So mash it up!