I've read no more than 3 Gb, but that was some time ago, before SP2. I'd like to go with 4 Gb, notebook memory is so cheap right now.
Also, what brand do you recommend for notebooks? New Egg has the best deals on Kingston and Crucial going now. For all I know it's all the same, just relabeled, but see there's a difference in latency and a couple of other things that may matter. Here's a link to the type my laptop uses. TIA...
http://www.newegg.com/Product/Produc...d&Order=RATING