what cineform product will work will premiere pro cs3 on a mac ?

Currently the codec is the only component ported to the Mac.

You can download our Mac codec as a Trial from our website. To purchase, Neo HD/2K and Prospet HD/2K come with a codec S/N for Mac (and Windows). In general our software offers many features beyond the codec, so with the products I mention we provide both Windows and Mac S/Ns so you get full functionality, even if you have to use Windows (or Bootcamp/Parallels) to achieve many of those fetures in the short term.

ok , so i can use Prospect HD with adobe premiere pro cs on a mac?

It's my understanding that Prospect HD/2K does not work on Macs. I believe it is only the Neo products that are compatible and not HDLink either. I could be wrong though.