My own tastes in jazz tend more towards DJ mixes and hip hop with a bit of Vangelis (Blade Runner) mixed in.
To start, I have to pay respects to Nujabes (You'll find some Nujabes music in the anime Samurai Champloo). Though the piece I linked is more mixed jazz he also did a large amount of hip hop beats layered with jazz atmospherics and instrumentals.
My favorite modern Jazz/hip hop/trip hop (whatever you want to call it) composer is probably DJ Cam through. I stumbled across his music while browsing at Streetlight Records (yes it was long enough ago that I went out and bought CDs). I heard this sweet music being played on the store speakers.
Fillet of Soul is by far my favorite music album. Some smooth vocals over a hip hop beat with wonderful jazz instrumentals. I think you can hear influences of Charles Mingus in the tracks (and the last song is certainly a Mingus cover). Unfortunately youtube only has a few of their songs but I think you can pick up the full album from amazon if you fall in love with it like I did. [edit: Yep. Link]