[juppy]

Before you go cutting a blowhole, have you checked to make sure all your cables are out of the way? If you have alot of cables hanging down in the air path from the front to the back, it'll block the air from moving as good as it could. If they are hanging down in the way, try to tie them up with plastic zip ties to some other part of the insides that it won't hurt (like the case frame, optical drives housing, etc....basically something that isn't moving). And yeah, the side fan should be blowing the air in to the cpu, unless your heatsink fan is one of the few weird ones that pull air up from the cpu....those aren't real common though, most blow down to the processor.