I was just wondering how easy it would be to add additional information to the registration page?

Example.... when you register with your name and address etc etc ... i would also like a form of drop down box where the customer can tick a box that may be relavant to their needs ?

Like .... what dietary needs do you have [diabetic] [vegan] [something else] [etc]

this i would then like to be attached to the users profile.... so that i can mail shot all the customers who are, lets say diabetic etc.

thanks