Certain forces in the improvised music scene right now (ain't gonna use the dirty "J"word), namely Dave Douglas and Ethan Iverson, have been making a small but growing effort to expose post 1970s jazz to a wider audience. They've started a list of essential recordings to have emerged post 1973 (an arbitrary year - Iverson explains on his site). I highly recommend it for those who have only a vague idea of what happens after Miles plugged in. Beware...it is a monster list, so here's the link:
http://thebadplus.typepad.com/dothem...iversons_.html
I recommend anyone interested in jazz have a look. Look up the titles on iTunes and listen to the first few seconds (if they have them)...that way you can hear what you're getting into.