We gave Charlie Wood an overview our Attensa Enterprise RSS server yesterday and he has a great write-up on Moonwatcher.
We're planning a July launch of our server which includes RSS proxy services, a web-based reader, optional integration with Microsoft Exchange and Active Directory, and support for secure feeds.
To simplfiy installation and configuration we'll be offering the server as an appliance. The major advantage of shipping a pre-integrated hardware appliance is the dramatically simplified install and config process. It's built on Linux, Apache, Tomcat, PHP, and an open-source database, and includes all of those components out of the box.
Charlie does a great job on his competitive comparison. In an earlier post he discusses the pros and cons of software versus appliance for installation.
Charlie - I talked to Matthew Bookspan this morning and he's ready for the podcast.