A couple former Googlers created this social network aggregator and it bubbled up on Techmeme. I saw a line about "2008's Twitter" so I needed to check it out.
What it does is brings all your social networking venues such as Twitter, Google Reader, Delicious, Facebook, Blogger all together in one stream that you can view and publish.
Problem for me is, I use all of these services quite differently. I'm experimental in Twitter and Blogger. I use Google Reader as a personal link archiving tool. I use Facebook to keep up with real friends. I use Delicious to promote social learning at my company.
By putting all this info in one place it zaps some of the value of each. As a content producer it bothers me. But as a viewer, I think I might enjoy tracking people across different vehicles, I might learn useful things or see a more complete picture.
What can marketers do with this? First they have to make the commitment to be a social marketer, then a diverse social marketer, then an aggregator of their own diverse voices. Is it worth the time and money, that's for you to decide.