I am using K2 and looking for some advice on creating 2 different groups. Both groups register to become members but one is Group A and they blog for one category, another is Group B and they blog for an entirely different category. How can I create registration forms for each group. I don't want a drop down in one of the forms fields to separate the groups, I want to use 2 different links that lead to 2 different forms for the 2 different types of users that submit 2 different types of content.

Any recommendations? I guess it may or may not involve K2.

Hello,

K2 (and Joomla! in that mattter) supports assigning a default K2 User Group out of the box.
I think you need a 3rd party extension in order to have multiple registration forms and groups.

Okay, do you have any recommendations on third party tools?

Akeeba Subscriptions was offering some of this functionality.
This is a developer oriented extension but you can give it a try.