>Lots of RAM. I did some research last year before installing Win7 and found that you really need at least 6 Gig before you get any benefits of 64 bit.

Yep - the more the merrier. Look carefully at laptops to see how much RAM they support. Lots of them support 4GIG or less max.
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>>OK, I'll probably be looking at a Win7 PRO 64bit laptop. What other factors should I consider?