A new version of class-dump is now available. You can download it from the links on the class-dump project page. It is built for Mac OS X 10.5 or later.
Version 3.3 adds support for Snow Leopard, improves property handling, improves structure/union handling, fixes a bunch of bugs (including two crashers), and no doubt adds some new bugs.
(Via Steve Nygard’s Weblog.)