I went for 2gb when I ordered mine b/c of the shared graphics memory and b/c I may run windows xp via parrallels which i have heard is quite RAM hungry.
I can't wait 'till the 13th - estimated delivery date
Soon will have: White MAcbook 2.0ghz, 2gb RAM, 120GB HDD
They told me 10th and its here, so u might get it earlier
I went 2Gig btw