We have created a new plugin, Level10 Blog Matrix (L10BM), that allow you to filter several WP tags by author and category. For example, the L10BM plugin calendar looks the same as the standard WordPress calendar, but can be filtered to only show dates where posts have been made in a specific category or by a specific author.
The plugin includes author and category filterable tags for:
– Category List
– Author List
– Links List
– Pages List
– RSS Feeds
– Recent Posts
You can use the tags al-a-cart or use them all and build a Full Blog Matrix which is a hybrid between a team blog and a multi-user (MU) blog.