I started experimenting with Social Media Api such as Facebook, Twitter, GData. There are plenty of libraries in .NET one can take advantage of. Just for fun, I wrote one tool that allows users to save wikipedia articles locally. The data resides in a local SQL compact database. This .NET app integrates status message functionality from facebook and twitter. Feel free to check it out at http://apps.facebook.com/wikiarticlesaver

These days I am also looking at TokBox api. In my humble opinion, Toxbox is a video chat service which integrates the best features in video conferencing, youtube, and skype. I love it. Most recently, I added some of my friends such as Garry Schyman and others there. TokBox was founded by one of the co-founder of youtube, Jawed Karim.

See below for a way to integrate TokBox in a site:
<object type="application/x-shockwave-flash" data="http://www.tokbox.com/vc/al8iat0y002k9zad" width="300" height="413" pid="495fd42c4c185981"><param name="movie" value="http://www.tokbox.com/vc/al8iat0y002k9zad"/><param name="allowFullScreen" value="true"/><param name="flashvars" value="guestList=true&textChat=true"/></object>