AFAIK the dell is the only laptop at the moment that supports multitouch. The HP Touchsmart also does (I have it running with Win 7 and new driver on mine). I seem to remember that HP announced that they will be introducing multitouch laptops in the future
and I'd trust them to do so - they seem to be willing to take risks like this. But at the moment, I think they only shipping laptop is the Dell.