Like anyone in marketing I'm constantly watching the "web 2.0" universe, as everything happening now on the Web indirectly provides a new opportunity to engage with people in different ways than before.  My pal Steven found this site which lists hundreds of sites created in the last year that are all about social media and the crazy online world that consumers are spending more and more time with every day.  There are great summaries of each site listed and of course links to check out more.  I've just spent a few hours and barely got through half the list.  Happy browsing!