Ping.fm

Ping.fm lets you update all your social media networks in one fell swoop. Really, anyone whose got time to be on that many social networks probably isn't doing much else. I would be interested to know what the average number of social networks people belong to these days, or perhaps more usefully how many people are actively involved in.  For me it's Facebook & Twitter, with Friendster, LinkedIn, MySpace getting a single login a month.

http://ping.fm/