Just to balance out this thread a bit, I agree the pre-Unibody MBPs are a great value but having recently switched I can say what stands out to me about the new MBP:
- I went from 2.4 to 2.8 so maybe that's why the difference in performance is noticeable (that's all I'll say about spec other than a small boost across the board and dual video cards)*
- better, brighter screen (no increase in resolution). This is my first non-matte notebook, which I was skeptical about but quickly adapted to, like, as soon as I saw it. Colors are vivid and its easier to keep glass clean. The bezel is behind the glass including around the camera so there is no edge to blow dust out of and to try to clean right up to
- the unibody machined out of a single slab of aluminum is really cool, feels more solid and no worries about warping around edges
- bigger trackpad / no button (trackpad is button) / glass won't wear out like old ones / gestures (instrux to add gestures to last gen MBP are posted on this forum)
- better sound: I don't have info to back this up but noticed a difference in both improved speakers and a clearer signal with earbuds
- sleeker
- magnetic latch is a nice functional and aesthetic improvement
- so easy to swap HDDs
- keyboard feels better IMO
- superdrive on the side works out better for me
- DisplayPort versatile & more aesthetic than DVI adapter
- this is really subjective, I know, but overall the new design really did it for me, so strikingly so that I upgraded despite having a well functioning last gen MBP
- looks like overall easier maintenance
- I've also heard the iSight cam is capable of higher resolution
*apparently Snow Leopard will take advantage of the GPUs for general computing, which I imagine will feel like another hardware upgrade