Wow, I guess I'm really lucky. I haven't had any trouble at all the last week and just checked my points and reservations after hanging up with MS for our April '08 trip.
Sorry to everyone still having problems and hope the issues get resolved soon.
Edited to add: What browser are you using if you are having problems? Have you tried clearing all of your cookies, temp files, etc? Is the main page of the site coming up at all for you? If so, is it letting you type in your name and password and then just timing out?