We first discussed TopoGun back in August, but back then it was Windows-only. Looks like they’re ready to change that as the TopoGun 1.05 for OSX will begin betatesting in just a few days.
TopoGun 1.05 for OS X is ready and the betatesting will start in a couple days.
Everyone who wants to join the betateam should register to the TopoGun forum and join the Betatesters usergroup.
TopoGun requires at least OS X version 10.5.5.