The 2 & 4 Jazz Metronome
I saw this technique first on an Emily Remler instruction video casette (yeah that long ago! p.s. if you don't know her playing, check it out, she's incredible!) and it's a REALLY good idea and I'd recommend that you get into this idea as soon as you start learning jazz, which is why I'm including this so early on.
It's pretty easy concept... put your metronome at half the tempo of the song, and the clicks will be beats 2 & 4 - you won't have a click on every beat that you would usually. It will really help your swing feel!