Quote Originally Posted by mcantu
More RAM always helps. 1GB for XP; 2GB min for Vista (I have 3GB)
Programs in windows won't use more than 2GB without some unrecommended tweaking.

Long set of articles but informitive for those who are interested.

http://www.anandtech.com/showdoc.aspx?i=3034&p=1

Until they start writing 64bit executeables - probably not worth spending an excess of cash on memory. I put 4GB in my new box but the last 1-2 was probably waste for the next year or two.