Compost on Snow Leopard works fine with 2 exceptions. The preference pane, like almost every preference pane that exists today, requires System Preferences to relaunch itself in 32-bit mode. I'm working on a new build that will eliminate that.

The other, more serious problem, is with the context menu plugin. Mac OS X 10.6 does not load traditional context menu plugins into 64-bit apps (such as Finder, for example). The recommended fix is to recreate the plugin's functionality as entries in the Services menu, which as conversions go is not small. I am working on it, but it'll be a few days.