A fun bit of trivia for the Joomla users out there from Brian Teeman's blog today - why the default user ID is 62 and how it could effect your site's security.

Andrew attempted to give the most complete answer but the truth is the answer is lost in the dim and distant past. There is nothing you can do about it. On every install a superadmin user is created with username "admin" and userid "62".

Since this is a common "feature" of the older Joomla installs, it could potentially be used in a sort of attack on the site. Fortunately, as of the Joomla 1.6 release, the installation allows you to select a username of your own (while still suggesting "admin") with a new change to the user's ID - 42 instead of 61.