Trike Related:
International Human powered Vehicle Association (IHPVA) Source guide and discussion groups.
Recumbents.com Source guide and lots of other stuff.
Bent Rider Online Online magazine with trike reviews and discussion groups.
Rick Horwitz's ThunderBolt trike Plans
Unusual Human Powered Vehicles Huge listing of HPV related stuff!
Comparison of 7 different Australian trikes
WorldLingo Translator Easy translation of those foreign language trike pages.