Geohot has just recently updated the website to include a download link for Mac users. That's right, now everybody can join in on the fun.

Check out the guide on how to jailbreak 4.1 with limera1n

Limera1n is now compatible with both Mac and PC, and the expolit has already been ported by @wizdaz, to work with PwnageTool, for those users waiting on an custom firmware package in order to maintain their current baseband. I repeat: ultrasn0w unlockers should wait for PwnageTool

So now we have a jailbreak tool for both Platforms, and a PwnageTool release right around the corner for creating custom, non baseband updating, firmwares. It's a great month in the land of Jailbreaking!