However when I pulled out the second 1GB non-apple stick of memory it seemed to run more reliably (though slower).
So today I went to frys and bought two 1 GB sticks of DDR2 memory. I was even a bit obnoxious at the register, when I looked at the two SO-DIMMs I noticed that the formatting for the serial number for the sticks were different, and I asked them to get me two that were more similar. (E.g. one was something like XXXX XXXXX and the other was XXXX-0-XXXXX, and in a different font).
Shockingly they complied and they sold me two sticks where the model number and one set of the two mysterious small fonted numbers matched.)
I hope that my guess that having DDR2 ram from two different vendors was the source of my systems instability.
At least while I was worried that the logic board was going, I backed my home directory up.