The company that started it all, Motorola, is now giving free lessons on Six Sigma. This move is driven by the aim of making Six Sigma accessible to every organization.
To launch this program, Motorola will be working in partnership with Type A, an e-learning organization providing learning solutions to drive performance across the enterprise. These online Six Sigma training modules take just six minutes each, and are designed for sharing. Sign up now!
Six Sigma : Your Resource for Strategic Management. Meikah Delid. Eversun Software 2006.

Motorola has a good program obviously, but there are other good online six sigma training programs also.
The Motorola courses are extremely expensive but probably worth it if cost is no concern.
These sites below are significantly less.
www.6sigma.us
www.1stcourses.com
www.sixsigmapartnering.com