Pssst! Wanna become enlightened? Free online classes in dzogchen/mahamudra
http://gyalshen.org/ngondro-practice-online/
http://www.ahs.org.uk/what-we-offer/teachings-by-email/
One of our long term participants has Lama Shenpen Hookham as his distant teacher
Various
http://gaiahouse.co.uk/retreats/online-courses/
Gaia House must be good, they banned me from attending in person. Had to do a personal retreat nearby in a fishing tent, in winter, in a summer sleeping bag. Life is dukkha. I had a great weeks retreat. Mantra, walking meditation, chanting, shivering etc ...
Zen
http://www.treeleaf.org
Two main teachers offer excellent guidance.
Any more?