Lately, I have been spending some time working with Silverlight in the context of the Facebook api. I've been amazed at the amount of data the api gives you access to. With the incredible growth facebook is experiencing (check this out: http://www.insidefacebook.com/2008/07/29/tracking-facebooks-2008-international-growth-by-country/), there are many opportunities blooming for developers that can use the information to improve / innovate with their own products.
Coding Library:
Silverlight
More Facebook Platform Resources:
