MacTracker says Aluminum MacBook 13" can go up to 8 GB. True/works?

My girlfriend is starting to bump into memory issues with her MacBook (13-inch, Aluminum, Late 2008), model A1278, when running larger apps (Aperture, etc.) and/or multiple apps simultaneously, etc.

Unfortunately we can't afford a new machine at this time, so I thought a RAM upgrade would give a quick and relatively inexpensive performance boost.

Anyway according to both Apple and Crucial, this machine maxes out at 4 GB RAM, which is what we've got in there now; however MacTracker says it can go up to 8 GB, and I vaguely remember reading on various websites that that is indeed the case.

I was just wondering if anyone has any experience upgrading one of these machines to >4 GB and how it has worked out for you.

Also is there any special type/speed/etc. of RAM I should buy, or just the standard DDR3 PC3-8500, DDR3 (non-ECC) that this machine according to the machine's specs?

Thanks!