Edelman Digital, the digital and social marketing arm of Edelman PR, has a great post on their blog about keeping up with all of your social networks:

Managing all of these networks often presents two options: either set them all up to post to each other and get the same content and updates on every network, or spend an inordinate amount of time typing made-up words into your address bar.

If you’ve got the right tools in hand, though, your task becomes a little easier. There are a few great applications out there that will help you manage all (or at least some) of your social networks all in one place, making interacting and connecting much simpler and more efficient.

Some of the tools they suggest?  TweetDeck, Brizzly, and Seesmic.