No multimeter, unfortunately... for what it's worth, the motherboard monitor software says 12v is running at 12.314, -12V at -12.862, -5V at -5.112, 5VSB at 5.145, 3.3V at 3.360 and 5V at 5.134... (fluctuations of about 0.10 on the -12V and 5VSB rails, as well as in CPU voltage).
It's an Antec PS, 350W if memory serves... running Athlon 3000+, 1GB DDR RAM, DVD+/-RW, two serial ATA drives, one parallel ATA drive, GeForce 5500FX video card, onboard LAN/sound.