I would like to get a MacBook, but the various issues I have read about (particularly excess heat) have convinced me to wait until Rev. B is released. My G4 iBook may not have as much resale value then, but since I only paid $650 for it in the first place I have considerable wiggle-room in that regard.
I have tracked iBook problems since the IceBooks were first introduced and I think it is safe to say that they have had the most hardware problems of any Apple computer line. Both my G3 and G4 iBooks have had to go back to Apple for warranty repairs, among other problems. And while even Rev. B and C iBooks have had bugs, the Rev. A versions tend to have the most.
If you don't need a MacBook right now, I would advise waiting and let others discover the bugs and give Apple time to fix them.