Thank you for your message. We are now preparing a new beta-version of Neat Image for Mac and expect that it will be ready for release soon as well. It will work with Photoshop CS.
I would also be very happy to help beta test. I a bit of experience in testing software and have tested Adobe Illustrator, Mac OS, and number of other apps.
I'm checking in again on this thread to see about the upcoming Mac version. I'm glad you're making progress.
I am evaluating one of your competitors, Noise Ninja 2.0, which runs on OSX, but does not yet include a Photoshop CS Plug-in.
I'm curious about how the two products compare (I shoot with a Canon D60 and 1DMarkII) and am most-interested in seeing a Photoshop CS plug-in version of NI for the Mac.