SCPlugin for Mac OS X is universal and being developed
:

The goal of the SCPlugin project is to integrate Subversion into the Mac OS X Finder. The inspiration for this project came from the TortoiseSVN project.

Current Features:

* Support for Subversion.
* Access to commonly used source control operations via contextual menu [screenshot]
* Dynamic icon badging for files under version control. Shows the status of your files visually. [screenshot]

there are some good new features and a quick test here on my ppc mini and my intel imac and it looks pretty good.