About a year ago when I started at Creative Commons, I was asked to write a Wordpress-mu plugin that would allow users to register with specific sub-blogs and not just the root/default blog. So I wrote a plugin that allowed that to happen and also fixed a few inconsistencies that I noticed in the code at that time.

Recently I reviewed my [old posts at the Wordpress-mu forums and realized that there was some activity on those posts that I hadn't noticed. It became clear that the plugin needed some modification and also that it only supported per-blog registrations for Wordpress-mu installs based on subdomains, but didn't work for installs based on subdirectories.

This past weekend I took another look at the plugin and found that most of the inconsistencies I had been seeing, and for which I had tried to code around in the plugin, were gone in v1.5.1, and so I was able to remove the vast majority of the plugin's code.

The current plugin seems to work for both subdomain-based and subdirectory-based installs, at least on a fresh install of Wordpress-mu that I was working with.

Update [Mon Aug 17 14:02:16 EDT 2009] : http://code.creativecommons.org/issues/issue436.](http://mu.wordpress.org/forums/topic.php?id=3090)