Adding more fields to the registration process In Drupal 7, is there a way to add more fields to the registration process? I was thinking along the lines of birthday, fullname, gender, twitter, etc. Also how do I access this data once it's in, so I can output it to my template files?
Since D7, field management is included in the core. Almost every kind of content has now the ability to be managed with fields.

You can go to admin/config/people/accounts/fields to manage user fields. There is also a tab for managing the display.