Functional Casemods?

attercoppe asks: "I'm looking for opinions and advice from Slashdot readers on a case mod idea. I'd like to install a second (small, low heat, no fan) power supply to run a single CD drive. The idea is to basically integrate a CD player into the case, allowing me to ditch my bookshelf stereo (yay convergence!). But I want to be able to use it without having the computer booted (to avoid waste heat and all the associated fan noise - PS, CPU, and two 4" fans). The question is, can I wire an existing drive, and maybe one of the supplemental fans, into both the existing and the new power supplies? Will one PS get feedback from the other through the drive? Do I need a switch to choose which PS to use? I know I won't be able to use the sound card... that's ok. No, I won't have a tuner for radio - that may come later. Tips, ideas, ridicule?"