^+1. There are very few programs that can use 8GB RAM. If you are doing heavy multi tasking (ie Photoshop, Pr, and Vegas all open at once doing work on all of those at once) then 8GB would help, assuming you have a 64bit OS.
I have 8 gigs of ddr2 ram but I decided to take 4 out and I'm going to sell them on CL. The reason for this is that I didn't see much benefit and it was making my overclock unstable from what I could tell.
I bought it cheap (30$ for each 2x2 set) and just wanted to try it, but even alt-tab-ing out of games I wasn't hitting more than 4, with firefox open, etc.
If its 64 bit windows 7 the answer is also no unless you are running 64 bit applications ....of which there are exceptionally few
Not quite true. You might want to run two or more 32-bit applications, each using 3GB, at the same time. Most likely scenario would be if you are running Virtual Machines. In that case the 8GB available to 64-bit Windows would be a distinct improvement over 4GB.