Frostytech and the Vantec fan thingy controller. I can remember when the first home-brew fan speed 'rheobus' was introduced on an enthusiasts website a few years back. Since then, a lot has changed in the computer world, and more than a few manufacturers have started producing their own variation of fan speed controller.
Dual AGP 8x stuff: OCA and Lost Circuits. AGP 8x doesn't do ANYTHING for performance now. The graphics cards can handle stuff on its own pretty much.