Gregarius 0.5.0 was just released, you can download it from the sourceforge.net download page.
Changes since 0.4.2:
About 60% of the Gregarius code was rewritten into a slick, object oriented, system.
A WordPress-like theme engine has been implemented, allowing for much more powerful customization of the application’s look and feel
Feed and Folder collapsing, as well as feed updating, are now handled via AJAX.
An RSS feed for tags has been added.
Some 54 new features added and bugs fixed.
And while we’re there, please allow me thank the crew from the gregarius-dev mailing list for their contributed code, their suggestions and support!
Update: because of tiny mistake in the dbstruct.sql file (unneeded for most users) I decided to re-release the packages. Make sure you download rss-0.5.0a.tar.gz or rss-0.5.0a.zip