Xoocle, an interesting Stumbleupon mashup (currently in Alpha mode) has been created by Thanassis. Simply enter your Stumbleupon username, and you are then given a listing of all your SU tags. The first tag will automatically do a mashup on that tag against other popular social networking sites – technorati, del.icio.us, and flickr.
This is a wonderful resource to see what’s going on in several communities at the same time. Keep in mind that if you have a general tag such as computers, you’re going to have a very wide variety of different hits across the different sites, but that just speaks to your tagging. Nicely done!