I bought a black mac back four years ago when all my friends bought white ones (they were practically a requirement for my college course) several were jealous and wanted the black one and a lecturer even said mine was a 'nice piece of work' when comparing it with his.
Now it's time to upgrade I have no doubts about getting a white one like mentioned there are not many white laptops around and I need a change. I prefer the white finish these days too. Back then there was a matt finish which got dirty really fast but the current ones is pretty.
I had a Blackbook 13" (refurb) - I think the difference was more RAM and bigger hard drive.
I ebayed it because the screen wasn't big enough. I'm an accounting student and I tend to put spreadsheets side by side. The LED screen is pretty awesome too.
Looking back I should have kept the 13 for when I didn't want to take my "best" laptop somewhere. For example, this Wednesday - jury duty.
Now I'm on ebay looking for a "beater" laptop that I don't really care about.
People have forgotten that there was ever a black Macbook made. I come into class and people look at my laptop are bewildered that I have a black Macbook. I always have people asking me, "where did you get a black Apple laptop?" or "did you do that yourself?"