My company is standardizing on Atlassian products such as Jira (for issue tracking), and Confluence for Wikis and collaboration. I have yet to use a system that works better than a simple blog with categories, pages and RSS feeds. I mean what is better than subscribing to a Page, Category (or tag) and contributing to the comment thread of a post you are interested in.
So far, I’m finding Confluence’s support for blogs leaving much to be desired. Starting with the fact you can’t subscribe to feeds with many readers since they require authentication and many (such as Google Reader) don’t support authenticated feeds.
Here is one option that uses a proxy
I tend to agree with Scott that a wiki without RSS feeds is a non starter. Email notifications? I find it funny that Confluence promotes itself as a solution for email chaos but then offer it as the primary mechanism for notifications.