I have a 1.33 12" PB and it is, by far, the best Mac (much less the best machine) I've ever owned. The size is ideal from a portability perspective, the weight was AMAZING for it's day, the screen is crisp and bright if a bit small by today's standards, and it was silly powerful. This thing was spec'd out almost exactly like the 15" PB but was ridiculously more portable and substantially more solid. All that, and it still runs as good as the day I brought it home and I'm a pretty heavy user! I'm finally in the market for a replacement and I'm more than a little let down at the available options. The MacBook would be great if, as so many have pointed out, the graphics were a bit better. The MBPs are just too big to be truly portable. I'd give almost anything to be able to buy a new one (or at least what I imagine the product would look like today had Apple not discontinued it.). In short, 12" PowerBook ALL THE WAY!!!
Man, I haven't posted in like two years. Feels good to be back!