I've I used MacMiner and straight commandline BFGMiner via Homebrew but you can get pre-compiled versions of the latest BFGMiner and CGMiner from here: https://github.com/nwoolls/xgminer-osx/releases

You can also check out my video showing me setup my USB Block Erupters on my MacPro: http://youtu.be/hGYwCDXLrdQ