I just got a Jump Lead from Troubadour in the UK. It was designed as a clip-on tuning pickup, but it can work really well as a general acoustic pickup if you put it on the right place on the instrument.
I discovered that if you clip it to a Fielding-Cutler Mute on the bridge, the sound is great: warm, mellow, very little acoustic feedback, but lots of chunky overtones. I like it!