In short, I'm convinced Fuser has stuck to its original plan of being a dynamic central email and messaging inbox, but has been pretty shrewd about adding new stuff that people like--like the Twitter feeds.

Fuser is now getting into the behavioral stuff too. Meaning that the app can track when and with what type of client you are most likely to receive email from your contacts, and when and how you are most likely to respond. For instance, the app might tell you that if you use Gmail to reach your boss on a Saturday, you're likely to get a response back in an average of 2 hours, whereas if you use Facebook you won't get an answer until next week. Stuff like that. To what extent Fuser will use that information to intelligently adapt itself to your habits remains to be seen.

Personally, I have five email accounts and three social networking message inboxes. Fortunately, I have my personal contacts trained to use only my Gmail account to reach me. My work contacts use my PC World corporate address. But for a lot of people those lines are not so clearly drawn. If I was in the unfortunate position of getting all kinds of email in all of my various accounts, and if I was more active on the social networking sites, I would be very tempted to use a tool like Fuser to preserve my sanity. I may yet.