If it's MBPs you're talking about, the 2.33 model also has a better graphics card, which could make a difference if you're running games or graphics programs. Other than that and the extra gig of memory, I doubt the extra speed would do much. You should definitely buy 2gigs of memory, and you might be better off spending the money on 3 gigs memory than on a small increase in processor speed. On the other hand, it's possible to upgrade to 3gigs later, and for much cheaper as prices come down.