I use ping.fm twhirl connected to ping.fm to update Myspace, Facebook, Twitter, AIM, Yahoo, not sure if there's anything to do it like a scheduled update though.
Ping.fm is a great choice. i just started using it recently. I use to use hellotxt but right now im experimenting with ping.fm. hellotxt is a great service. Its one of the few sites that can shedule status updates for you. give em both a try. Status updates in my opinion are better because there are many ways that you can go about it. No one I know uses bulletins anymore, Its spam central now a days.
