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Flam Accent is a great rudiment to use around the kit. You will hear it in Tony Williams and Gregg Bissonette's playing all the time (and Dennis Chambers too). It's basically a way to link flams together in a triplet lick. The flam is usually played with the grace note on a tom and the accent note on the snare, and the two linking notes on either (or cymbal too). Nobody could play flams around the kit like Tony!
I think any rudiment that (1) forces you to think about different stick heights/force of attack and (2) forces you to work on your left hand (OK... 95% of us need this) is worth checking out.
Just as an aside, I don't get a chance to work on my hands much anymore (single dad with 2 busy boys), but nothing helped my rethink my whole approach to how I hit a drum like JoJo Mayer's DVD did. That thing is just a work of common sense, kinetic, physical genius. Or whatever you would call "how to play the most complicated shit in a completely relaxed and effortless way"!
My first post -- glad to be here!