Bought two CORSAIR 2GB 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300) memory sticks, insert, power up and good to go! Went from 2 gig to 4 gigs on my wife's Macbook. Been stable for 2 weeks now.
After reading the comments here, it seems like many people are trying to pair up odd memory stick configurations (2 gigs + 1 gig, 4 gigs + 2 gigs, etc). From a PC/Windows perspective, this wont work and it seems to be a problem on Mac's, especially ones that use Intel hardware. Do yourself a favor, just buy two new sticks of the same configuration (1 gig, 2 gig, etc) from the same company (Corsair, Rosewill, Patriot, etc).
Bought a Crucial M4 CT128M4SSD2 (128 GB SSD), removal was quick and easy. This was my wife's mac, I personally do not own Apple products. My challenge was that I had to erase the drive (which in the process re-formats the ssd) which got the install up and running.