WordPress 2.9 was built with the new ability to extend the User Contact Info fields, this trick can be done by adding some code on functions.php within your current theme.
We can add lots of contact information, depending upon your needs. To extend user contact info, open the files and add in this code
And the result of this trick will be like this,
This is only a basic example and you can make it more complicated depending on your creative needs 😉