Grouper version 1.4.3 was released today, adding the ability to convert Atom 1.0 feeds to RSS. The Atom 1.0 format specification is essentially a few bureaucratic steps from getting the official IETF stamp of approval, and any changes that may be made to the document
are unlikely to affect the format
. Some of the other people involved in the effort to create the specification have already started publishing feeds in the new format, and once everything is official, more and larger publishers should start switching from Atom 0.3 to Atom 1.0 quickly, so it's time for consuming applications to start supporting it.
The new version with the Atom 1.0 plugin has been sent to everyone who purchased Grouper version 1.4 or later. Those who purchased Grouper prior to version 1.4 can upgrade by purchasing the XML and Atom plugin package separately.