Ditto!
They have yet to implement some of the elegant and new design features of the MB into the MBP (flat keyboard, removable HD, magnetic latch-free closure). The MB, by comparison is still very new in terms of design. The guts just got a major overhaul about two weeks ago and I actually ebayed my 2.16 to get the latest 2.2 Santa Rosa chipset MB. As a long-time MB user it was worth it for the improved graphics and faster bus speed & officially supported 4GB RAM capability. As another person said above, now is an excellent time to buy one, especially the midline white model (I love the black one but refuse to blow an extra $200 for it when that $$ could go towards an warranty, more RAM, etc.). Out of the box, that model is ready to rock.
I think it's going to be a good while before they do a major external overhaul to the MBs design. One thing they could change w/out an entire case re-design would be a larger LED-based screen. The bezel on the 13.3" is huge, so there is room to do it. But outside of that and chipset upgrades, I don't think there's going to be a design overhaul for a while. Esp since the MBP is almost identical in structure and design to the very last model of the PowerBook and is LONG overdue for a redesign. Esp with all of the heat issues that are popping up everywhere.