What is your source for discovering new music?

Buying used Cds from the bargain bins using All Music Guide as a reference.
I go through the large junk bins at several local stores and the CDs are all $1/#2. Pull anything that seems interesting. then check it in All Music Guide. Buy the clean ones with good ratings. Some stuff i am not crazy about, and a lot i enjoy.

weird thing for me, is when I search for a jazz title on Amazon.com I will then view the "what other people bought in addition to this" (or whatever it's called)and I see other titles and get to listen to snipets of them.. I have bought several cd's that way of artists I was formerly not familiar with. BTW I am mainly an LP guy.

local college radio station WIDR and internet radio WFMU

I often buy more than a CD each week...

Xiekitchen, yes, Amazon does have a nice way of offering other selections. Nice too you can listen to snippets of the selections most of the time.

Blue Coast Records, Concord Music Group, HD Tracks, Linn Records, Naim Music.Com, Internet Archive, Itrax.com, 2L recordings, Reference Recordings, Opus3 Records. Analouge Productions, Acoustic Sounds. Get started with these. That should take you awhile and give you many styles and genre to discover.