I have switched from a 13" Pentium M 1.xGHz, 1GB RAM notebook to a 14" iBook 1.33GHz G4 with 1.25GB RAM. Very happy with the iBook. Even tough it is still a bit slow, but it is much better compared to the Pentium M.
You don't even need to calibrate the screen for iBook.
You don't even need to calibrate the screen for iBook.