I just checked in rudimentary support for Mark Nottingham's Atom Syndication Format 0.3 (PRE-DRAFT) and Mark Pilgrim's Atom Feed Autodiscovery (PRE-DRAFT) into the RSS Bandit CVS tree. I expect there to be bugs and incomplete feature support but it is good enough to read the various ATOM feeds being produced by Blogger since I can now subscribe to the ATOM feeds of Evan Williams and Steve Saxon.

The screenshot below shows Mark Pilgrim's ATOM feed.