I know on my G4 I used risers because of the issues with the fan and dust it was recommended to lift it higher off the floor. Are these necessary with the new G5's? I haven't seen any as of yet and wanted to ask just to be safe.
Don't think its as much of an issue with the G5s, but I might be wrong. Can't hurt to open it up and spray it with some COMPUTER FRIENDLY aerosol spray or whatever environmentally friendly sprays are out there to clean out dust, but thats only maybe once a year.
[Edit]: are you sure they were neccessary w/ the G4's? Mine has been running for years under a desk in an old dusty house with several shedding pets for years. W/ the G5, the one I use at work resides in a rather dusty sideroom and I've experienced no problems or performance abberrancy. Also, I've heard the Powermacs deal better with dust than most PCs.