Sony and Fujitsu have had white models out in the past too (and Sony's with a plastic casing may have even preceded the original iBook).
I really, really want a black MB...I mean, I really want it to be black -- but at the same time, I HATE paying money for a freaking color (and I'm a student and on a budget and so it's leaving me very Sophie's Choice). I have a Black 60 GB iPod, so I want it for matching purposes, but I also just love the look. My media rig (PC) is piano black high gloss, so the MB would match everything. Still...paying for a color kills me. I'm have tempted to just get a white one, some really nice acrylic spray paint and tape it off and paint the damn thing myself -- a la Colorworks, but I doubt I'll do that.
I think it's messed up that they are still charging a premium for a freaking color, after a year -- I mean, they didn't do that with the iPod.