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+1 for the 13". If you have tons of money to blow (which I sure don't) buy the 15". Otherwise, it's a much better deal to get the 13" and buy a 3rd party external monitor. Then you'll have 2 monitors to work with :D . That's what I did when I had a MacBook.

+1 for this. Best of both worlds. Maximum portability if you are travelling around a lot and then hook it up to a large monitor at home and you get decent screen real estate too. It's what I would have been had it been an option pre-unibody...
 
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