I’ve been running Snow Leopard (Mac OS X 10.6) developer releases full-time on my main Mac for the past 3 months. I do this with all major new releases so I can iron out bugs and really get to know the system before it goes public. For 10.6, the public release is this Friday, August 28.
All Red Sweater applications are Snow Leopard 10.6 compatible.
The only serious compatibility issue I ran into during testing was a crashing bug in MarsEdit. Today I released MarsEdit 2.3.3, which addresses that problem. In addition, it includes a few other fixes for pesky bugs that might have affected you even on Mac OS X 10.5.
If you run into any issues using my products under Snow Leopard, please get in touch. It will be my highest priority to resolve compatibility issues, should they arise.