Rawzor SDK for Mac was released a few weeks ago. It supports both 32 and 64bit applications on Intel and PPC platforms. SDK is now available free for 32 bit and 64 bit Windows, Linux and Mac and allows image processing software to open compressed .rwz files directly.
Rawzor for Mac OS X supports OS X 10.4 (tiger), 10.5 (leopard) and 10.6 (snow-leopard) on Intel platforms.