How many times have you built a site, and your client asked you for some additional information about users who register for the site? They wanted to collect their mailing address, date of birth, a favorite book, or even they just wanted them to accept the terms of service. Unfortunately, in Joomla 1.5, you would have had to install a complex extension like Community Builder to acheive this functionality. Now, however, it's built into Joomla 1.7.
Here's how to configure expanded profiles ... Click here to read the full article on Barrie's site