Let's see.....
2 Hard Drives (Both IBM, one 8 GB and one 20 GB)
1 Pioneer 8x DVD-ROM drive
1 Generic Floppy Drive
1 MSI GF4 Ti4200 (overclocked to 600/300)
56k Modem
Soundblaster Live! Value
MSI KT3 Ultra2 Motherboard
1 512MB DIMM PC2700 DDR (Apacer)
1 Wireless Reciever (Logitech Freedom 2.4 Joystick)
2 Fans (Both 80mm, one's a 3000RPM, one a 4800)
1 Athlon XP 1800+, overclocked to 2.0 GHz
That's about it for things that recieve their power from the PS.
I'm not sure if it's the amount of power that's the problem, but the stability of the power supply. I'd still like to increase to at least 400 though.