TAD... phew... Jazz Funk...
Erm it's extremely broad I'd say... in the same way as say "Rock" and "Metal" have changed over the decades so has Jazz Funk. I suppose if you take the more kind of melodic sounds of jazz and give them a rougher, basser sound, lots of percussion and hints of latin sounds you'd be someway to getting Jazz Funk.
Some examples...and are quite diverse, some more commercial than others might be...
(Roy Ayers is kinda like the godfather of Jazz Funk I'd say)
Early Level 42... such as this track - Love Games would be very much considered Jazz Funk... (wicked bass playing)
So called... Jap Jazz/Funk (smooth.....)
Azymuth... one of the key Jazz Funk bands, remember when you listen to this stuff you have to put it into context of the time, the technology available, music production, trends... this sort of stuff, dance music, disco.... all having an influence on the future hip hop and house music scene.
Even the scotch could do it....
And a modern take on the genre... by German producers Jazzanova... (sweet...must admit I haven't heard this track before and I like it alot)...if you listen you can here the almost signature jazz funk sound.... the vibes
What looks to be a good wiki article here (not read it fully yet) - http://en.wikipedia.org/wiki/Jazz-funk