Yes but screen spanning doctor will allow you to screen span from an ibook thus cancelling out this pb advantage. I love screen spanning from my ibook (which is on a icurve, hooked up to kb and mighty mouse and 17' Samsumg LCD when it is home).
I have a 14 inch 133 with maxed ram. It is a great and economical machine. It was bought for me by my univ. dept. If I had had my own choice, though, I would have gone for the 12 inch for portability (but the 14 inch is not bad compared to my former toshica brick).