This is just a short list of recommended resources about psi, feel free to put more in comments.
- psionicsinstitute.org The second psi site I've visited that had good info; a lot of it!
- castrealspells.com/thepsionshandbook01.pdf Basic EM, psiball, basic empathy and telepathy
- astralsociety.us A society of magicians (psi-/chi-/ki-/etc. users)
- kinetics.practiceforum.com A forum (obviously!) (UPDATE: not very active)
- vsociety.net Less structured than this site, but a few gems for beginners if you have the time to look for them
- psipalatium.com The beginner pages are good, though I haven't looked at the advanced pages yet
- community.psionnation.com It's sort of like PsiWikia
- spellsofmagic.com Has spells used by others, which means …