My eleventh fan:
I added a 92mm exhaust fan to the right-side panel, to aid in cooling the HDD's. Although it doesn't appear to be moving a whole ****-load of air, so I may need to buy a better fan.
I cut it using only a Dremel with two cutting discs. I then sanded and cleaned up the cut a bit with a sanding stone for a drill.
I'm really happy at how round the hole is.
Man...this modding thing.......it's got me by the balls now, LOL
EDIT: I screwed up on one of the holes, and had to drill another right beside it. Apparently my fan grill moved a hair while I was punching the holes.
EDIT 2: WHOA! I just looked at Everest, and it seems to have cooled both of my harddrives down around 4 - 5*C.