American Power Design - Designer of high voltage DC/DC converters. Product offering is from 0.5 Watts to 200 Watts and up to 8000 VDC. Full custom products available.

Winding Your Own Induction Coil - Make a simple HV induction coil. With a TV flyback and other cheap parts.

Sam's Laser FAQ - HeNe Laser Power Supply Design

Mike's Electric Stuff - Vintage electronics, valves/tubes, lamps, geissler tubes, historic display devices, High voltage, tesla coils & misc. other science stuff.

Water Resistors - For High Voltage. Made with copper sulfate.