BuddyPress.org

Thanks for the mention nickbwatson. I did not write the code, it was assembled from several sources with help from BP developers.

In my version I generated the username/user URL from the fullname, onkeyup on the form. I use the same javascript trick for blog name. I think there were some security objections to doing that, but it works for me for now.

Someone earlier also posted a simpler php version that produces an entirely random string as value for username on a hidden input field. Can’t find that post…