Making Your PC Dust Free?

Kranfer asks: "Recently, I cleaned out my PC to find not only dust... but also feathers from my from rather large parrots. I have struggled with keeping my PC dust free for years, but I have yet to find a workable solution that will keep the dust from stacking up every few months, inside my PCs at home. I was hoping that my peers on Slashdot might have thought up some innovative solutions to this common problem with any PC. How does one cut down on the dust entering a PC and sticking around? I run an Antec File Server Case with each and every fan slot taken blowing out, and even one of those Harddrive coolers and PCI slot coolers. What have you done to rid yourself of the dust and pet dander inside your PCs?"