I don't have braces yet so I can't give you any specific tips on that, but when I first got my Oral-B I stopped doing as much of the vigorous "back & forth" motion with the brush. Instead I focus on one tooth at a time and the gum area around it and let the power do all the work

Oh and I don't use regular toothpaste in the tube anymore, I get the Colgate 2-in-1 Toothpaste & Mouthwash (can you buy that where you live?) because it's a bit more liquid and froths up better. The tube stuff is generally too thick and gluggy. This doesn't replace regular mouthwash despite it saying that it can - its just a better texture.
Anyways, hope you've had a fantastic Christmas and Happy 2008 which isn't far away!