4 MAWDs, an HA45, an RRC2 Mini, a PF Minitimer, two Big Red Bee transmitters, two homemade/designed GPS trackers, and two homemade/designed telemetry transmitters for the MAWDs. I'm probably forgetting something. Oh, yeah, a Xavien timer that I've never flown. All of the rest of the stuff has flown. Plus an old RRC2 that flew about 35 times before disappearing in the swamp at Bong. And I suppose you could count the Sparkfun SD Datalogger hooked up to an accelerometer, which flew a few times but is now dismantled.
Edit: Oh yeah, also a Missileworks WRC (lotsa fun - flown quite a few times), and one of those PF little no-deployment altimeters.