Tim,
I would have to disagree with you regarding your statement that the Pentium M laptops are slower then Pentium 4 systems. I used to edit with a Pentium 4 laptop and it was a)heavy b)would get very warm. Due to these reasons, I decided to purchase a laptop with a Pentium M processor. My Pentium M processor easily beats the Pentium 4 system (3.4ghz w/HT) in terms of redering times and other processor intensive tasks. I am using the same amount of RAM (1GB)