There are several things I don't like about the MacBook...
Before I even get to that, can anyone explain why the equivalent 15" PB is the identical price? What incentive is there for me to buy any of the PPC PBs if I can get 4x the performance (even if it's only 2x real-world) by going x86? That's just plain bad planning. Now they're gonna be stuck with a boatload of PPC PBs (especially the 15" one).
I see no reason for them to effectively withdraw FireWire 800 from the market. And, as others have mentioned, why aren't there MORE USB ports? What, does Steve still hold a grudge over USB winning out over FireWire?
Since Apple is now producing (so to speak) an "x86 notebook", they'd better start being feature-competitive with other notebooks. Yes, arguably they've got a much better graphics card than most notebooks do, but unless you're a gamer who uses a notebook, I'd think more ports, not less, would be the way to go.
I also think Apple should have further cosmetically changed the new PB to differentiate it from the PPC PBs. But, that's just me, I suppose.