http://www.allprosound.com/catalog/productdetails.asp?fprodid=428

*drools*

That thing is SOOOOO small, yet runs the full audible range, 20Hz - 20kHz. WTF? I don't know many regular mics that do that. I've always wanted a headset mic because I hate being stuck behind a mic stand (especially since I've gotten in the habbit of jumping at the end of certain songs), but most headsets are huge, bulky, ugly, and make you feel like a pop star wanna-be. Plus they hurt to wear for long periods of time.
This one comes in a variety of colors, in attempt to match basic skin tones.

Expensive.... about $358.

And doesn't include the actual wireless system.

I've never really cared for wireless mics, with all the potential problems such as interference and weak batteries. I've never used a wireless mic with as full a range as a wired mic either, but this one does look interesting, though.