Bas chords, although to i know they exist i never se them used in songs much. what i really want to know is can u get chord diagrams so u can learn how to play them. How do u find out how to use them?
Jonas Hellborg came out with a pretty comprehensive 4-string chord dictionary. I don't remember who publishes it; it's long and skinny like a Zagat's, to fit inside an instrument case. Barnes & Noble sells it.
As Angus says, it's more beneficial (and actually easier) in the long run to learn some theory. I always found it easier to construct chords from the ground up than trying to remember 6000 chord diagrams.