[X4U] RAM Memory - What's the max?

[Robert A. Virzi]

More memory is good.  I have heard conflicting reports on max memory 
for macbook pros.  I have a 2 Ghz intel core duo MBP with 2 gig of 
RAM.  I'd like to add more, especially to help with running 
Parallels.  I've heard:

2 gig RAM is the max

3 gig (1Gb and 2Gb strip) will work (Apple store)

4 gig (2 2Gb strips) see 
http://www.newegg.com/Product/Product.aspx?Item=N82E16820146684

Does anyone have experience in going over the original 2 GB RAM limit 
on this machine?
		-Bob