The MobileMe web app went down for scheduled maintenance last night, and returned this morning with an overview video. In about three minutes, it points out the features of the recently-redesigned Mail web app. Those who have been using it for a while won't find anything new in the video, but it's still a nice review.
It starts by describing the different view options and how to enable each. Next the friendly Apple voice demonstrates how to create and apply rules, and finally moves on to several formatting options (another recently-introduced feature).
Again, anyone who's been using the web app for the last few weeks won't find anything new, but it's still a well-done over