Originally Posted by Salo
How much of a difference would it make to add more fans in addition to the two that came with the case?
Also, would I need a fan controller? I've seen them mentioned a few times, but I'm not really sure if that is something necessary at all.
It depends on the fans, you might want to draw up a plan in paint or something so you know where you're going to put your fans. Make sure that you don't have a faster fan pushing air into a slower fan as this lowers the speed of the air being pushed and it also wears out the second fans motor more. You really want identical fans/slower fans infront of faster ones. You'll also want to make a wind-like tunnel, so the air is drawn from the front and side and exhausted out the top and back.
A fan controller is entirely up to you, I got an 'el cheapo and used that for 6 months and liked it. I'm using a Lamptron one now and I really do like the ability to adjust all the speeds separately for when they're needed.