I am so sold on the Xoom after a day with it, the controls are awsome and feel very natural after only a short time. The voice search is so well done, add these controls and ill be skipping the iPad 2 which i was considering coming feom the iPad. The Xoom and Honeycomb have won me over. Simply feels how a tablet browser and OS should be. Android has come a long way in a very short time.
Kudos to Google.
To answer what they do.. basically a small swipe from either side of the screen and a arc type menu pops up giving you all the basic contols. Forward, back, favs add tab, pull up url boc etc. So no matter how you hold the Xoom the controls are literally at any fingertip you want. Brilliant design.