there are many other, less common drugs we've overlooked here, like
dmt, dpt, amt, 5-meo-dmt, 5-meo-dipt, tfmpp, bzp, pcp, 2c-t-2, 2c-t-7,
dom, dob, 4-mta, etc.  you can find out about them, and you can also
find out almost everything you could possibly want to know about
drugs, from huge lists of journal abstracts to hundreds of trip
reports, on these sites:

http://www.erowid.org/
http://www.lycaeum.org/

the internet is the #1 resource for practical drug information,
period. there are also a couple of classic books that you should check
out: 'pihkal: a chemical love story', and 'tihkal: the continuation'
by ann and alexander shulgin, transform press, berkeley, ca

written by world-renowned psychopharmacologist and organic chemist
dr. alexander shulgin, these books contain detailed descriptions,
including complete directions for lab synthesis, of over 230 different
phenethylamines and tryptamines.  they are indispensable references
for the drug connoisseur.

another great book is 'from chocolate to morphine' by andrew weil,
m.d. and winifred rosen.  'the emperor wears no clothes' by jack herer
discusses the history of marijuana prohibition and its failures.
'psychedelics encyclopedia' by peter stafford is an excellent
historical reference for most recreational drugs.  the websites above
also have lengthy lists of excellent books, some of which are online
in their entirety.