Recently we posted about Capture One’s (lack of) compatibility with OSX Snow Leopard and reiterated our standard advice that upgrading to a new OS immediately is very inadvisable.
For completeness: here is a resource which lists various applications’ compatibility (or lack thereof) with this new operating system.
http://snowleopard.wikidot.com/
Without a doubt most mac programs which are still being developed will be made compatible with Snow Leopard quickly (weeks or months). In fact the future is very bright in that Snow Leopard introduces some fantastic tools which developers can harness to greatly speed up their programs. However, for now, those of you who use your computer for day-to-day production work should be weary of upgrading.