Just saw this... in 3D games the 1.33 12" pb is actually almost as fast as the 1,5 15" with the 64mb 9700 radeon that is. Although I doubt that it would make a huge difference with the 128mb version. That said the 12" is only 1-2 frames per sec away from the 15"... so I guess at least gaming is not really an excuse for getting the 15"
http://www.barefeats.com/pb11.html
http://www.barefeats.com/pb11.html