My Laptop is Now a Desktop

The display on my notebook, a 4+ year old Dell 600m, has crapped out.  I haven't totally given up on it, but more than likely, I'll end up buying a new computer in the next month or so.  But for now, I'm tethered to my desk and using a borrowed 17" CRT, which kinda sucks, because my desk was famous for looking cool.  But what sucks even more is finding a new laptop.  My little 600m is a surprisingly tough act to follow: it weighs 5.5 lbs, has a 14.1" SXGA+ (1400 x 1050) display and a video card with dedicated memory.  And it's FOUR YEARS OLD!  By comparison the 15.4" MacBook Pro has lower resolution despite the larger screen, and also weighs about 5.5 lbs.  After four years, I want a laptop that isn't just faster, but lighter too.  And so far I just can't find one...