Well I planned on posting a rate my startup question this weekend since we're just starting a hackathon tomorrow to squash some bugs, but the way we think we're going is a online interactive walkthrough of the site when a user first logs on to give them an idea of what to do next. We tried to use amberjack but it seemed a little limiting so instead we wrote our own utility using jquery and expose. I would post a link to the library but I'm on my stupid iPad right now so just search for jquery and expose and you'll find the library we use.