Hey Peeps. I've found a couple of Xbee applications that work on on a Mac.

XCTU for Mac

Digi has developed a version of XCTU for Mac. You can download it from the Digi website here
The sparkfun website has a good getting started tutorial for XCTU here.

CoolTerm

CoolTerm is a terminal program designed to work with the Xbee.
It is freeware made by Roger Meier. You can download it to from his website here.
You can find good getting started tutorial by Matt Richardson here.