Collablog. Got some spare web server space lying around? Fancy yourself as a bit of a blog network mogul? Or a mega-blog community owner? Then download either version of this freeware package and give it a go. From the sparcity of the site it looks like early days, but the two packages seem fully equipped with everything you need to set up a new Metafilter or TypePad type service. Free for non-commercial use, but there are no terms for commercial use available yet, so there’s time to play around before you make your millions. 

 Collablog Portal Edition is for setting up and running large scale blogging platforms for multiple users, i.e., a large network of blogs, such as TypePad, Vox, WordPress.com, etc…Collablog Community Edition is for setting up community blog, or large group blogs, i.e., many bloggers posting on one blog, such as Mefi.