I am terrible about not cleaning out my computer. Mainly because it's a gigantic pain to unhook all the junk in the back of it and I have to unhook all that to get the tower out enough to take the side off. I really need to do it more often though-my HD crashed last week. :( Luckily I had it backed up but it's still a pain and cost $$ to replace. It wasn't because of dust because I just had the mobo replaced in June so it was clean as of then, but before that I didn't clean it much. I recently bought a small airbrush size air compressor-I guess I can use that to clean it out.