Metronome EXP looks like the perfect metronome. My favorite hardware nome is a DeltaLabs DMT-1 I picked up at GC for something like $12 or $15.
http://www.deltalabeffects.com/products/prod-detail.cfm?product=DMT-1&modid=13

What I like about the DMT-1 is that it plays a variety of rhythms.

Looks like EXP has the ability to have these rhythms setup and saved as presets.

Very cool ... plus it's zero-install

Thanks for pointing it out