It's a common complaint: with all the social networking sites and blogging options that our friends are always asking us to join, we're getting over-extended. By the time you've had your first cup of coffee in the morning, you've no doubt updated your Twitter account, added some bookmarks to Delicious, added links to your FriendFeed, and shared your favorite news stories on Google Reader, posted to your personal blog, and uploaded a photo to Tumblr.