yeah one of the instruments I don't talk about too often is my trombone, I used to play a ton. During college one of my buddies transcribed "Free Variations" from Mikrokosmos, no. 140. I notated it for him (on the computer, from his hand-written scratch) and then a t-bone quartet performed. Man, Bartok is never the same once you've heard it performed by 4 trombones.

I still have the file, and also "Wrestling" (M. no. 108), if you're curious.