Update:
Installed my Kingston 2x1gb FB-dimms last night, and also added on 7 small attachable heatsinks on each side of the memory for a total of 28 heatsinks added.
One thing I'm trying is to align the heatsinks so that the airflow can go past it without obstruction. That means to attach the heatsinks with the fins all horizontal. I took pictures, but forgot to bring my camera to work to upload them. I will upload the pics tonight.
I'm happy to say that initial results are very good. I spent a good four hours or so installing windows and all my PC apps as well as getting all software up-to-date. So while I wasn't running anything super processor/memory intensive, I did keep the system busy.
During the installs, I would sometimes have to swap out drives as I set them up. I touched the heatsinks on the kingstons and they were warm but not hot as in I could hold my finger on them. Did not feel any noticeable heat radiating from the lower area where they were installed. The Apple's felt about the same, only ever-so-slightly cooler.
No fan noise increase or errors.
Again, I will post pictures later tonight.