Extending the Registration Process?

Hello All,
I have two customer groups setup; distributorsand consumers.  I want to control pricing based on the customer group (for example, do not want consumers seeing the wholesale pricing).  During the registration process is there a way to automatically associated a user to a customer group?  For example, how would I go about putting an identifier on the registration form so the user can enter some credentials indicating they are a distributor vs. a consumer?

Thanks for the help!

madv1457 wrote:
You can create a customer role for "distribuitors" and then define in prices by customer role their corresponding prices. Anyone else will see consumer prices. Then during registration set a field for "I want to be distribuitor" and when you validate that he is really a candidate for that yo assign  him the distribuitor role (through administration). Other wise anyone who says he is a distribuitor can se wholesale pricing.

Thanks Eduardo,
Does the part - set a field for "I want to be distribuitor" - have to be done through custom development or can that be done through configuration via the admin module?  

Thanks again!