I just saw a link to this video on Twitter today and thought I'd share it. If you go to Tipsquirrel.com and do a search for Lightroom, you'll see quite a few. Adobe has a lot of wonderful videos too. Short and to the point.
I had already forgotten the Tab shortcut to see hide the side panels. Just call me sieve brain! But this video shows you how to have your cake and eat it too, by hiding those panels but still getting information on your photos.
I hope this one is helpful to you Lightroom users out there! I'd love to hear of any video tutorials you've found also.