Very cool.  What is it?  Or did you build it?

heres what i use... runs on 3 9v.  multi effects / circuit bent

http://www.youtube.com/watch?v=wYVtWmUYBzw

well it always sends clock, so youd need another way to do the start/stop message.

Meaning I could stomp on it to start a piece of gear?

plus you can cc it via midi and then make it clock master, allowing thigns that dont send midi clock but can send midi cc to be a sorta of clock master.

This I didn't know.  I am a fan of this feature.

the m5 has tap by foot stomp and via cc.

I hear you there. BUT a tap bpm isn't horrible in a live situation. I still dig it lol

Also pretty cheap.
I think I'll get one myself.

edit: too bad it can't be synced

edit2: and it IS behringer.

TBH, I have a REALLY good time with my Behringer Tweakalizer. It's really simple, but it's easy to use and a blast live.

I have a KP3, and its very reliable. The Kaoss Quad lets you do more than one effect at once, I thought that was pretty cool

All of these look really cool.  I guess I've got some more thinking to do.  Thanks for all the suggestions!
I've got plenty of software effects.  I was looking for something more organic that I could play with without having to sit at my computer.  Even so, I'd gladly take suggestions on good software effects.  Btw, thanks for those you suggested, Victory Road.  I'm gonna check those out.

If you're not sure what you want, you could pick up a second hand Alesis Midiverb for cheap if you look around. Does all of the "standard" effects, and is an old favourite:

http://www.alesis.com/midiverb4

Also there's the more limited Microverb:

http://www.alesis.com/microverb4

if you don't need them live, just use VSTs

It'd be fun to have an LFO I could trigger manually, high and low pass filters, a stutter effect, flanger, phaser, or anything else fun