I pretty much love my pretty white little MacBook, except for the few gnawing differences that, as a longtime Windows users, really annoyed me. The NUMBER ONE problem I had was that I couldn't use the keyboard to tab through links, or make selections in popup boxes. Also, when filling out form, tabbing through the fields skipped checkboxes and radio buttons. Argh!
Turns out that there is a simple preference to fix this problem. I have no idea why Apple doesn't make this the default setting.
Thank you Tony Spencer!