I'm playing with Ning.com a new online social application "playground" that's in Beta from Mark Andreessen's (the man who brought us Netscape back in the mid-90's).
It's a very easy to use online platform for building and using social apps.
"Social apps are web applications that enable anyone to match, transact, and communicate with other people."
I'm always game for playing around with apps like this because you can find other developers doing the same and potentially tweak your own stuff or discover other ways to do what you've been trying to do.
They've got a nice blog that's tracking how people engage with the "playground" and the different apps that they create.
I headed straight for their App Ideas to check out the possibilities.
They've also got a great tagging system where you can see everything created on Ning