There have been other sites – FriendFeed is one that immediately pops to mind – that have tried to become a central hub for all of your online activity. But I don’t know if any have ever tried to pull your online activity into one location as a repository, not just a hub.
Now, the creator of the instant messaging protocol that powers much of the world’s online messaging has made that the goal with his new company, Singly. Sounds very intriguing!