How Do I create a multi-step registration form?

Hi there,

I would like to create a multi-step registration form like the one DrupalSN is using (see it in action) and I need some help because I don't know if I have to create a custom module for this or I can use a existing one.

This is the process I would like the users follow:

1. Choose a role, ie: company, customer.
2. Present the general information, ie: username, pwd, etc. And also specific information, ie:
   • For company: Company name, logo, etc.
   • For customers: Fisrt name, last name, avatar, etc.

This are some of the modules that I'm using:

• CCK
• Content Profile
• Auto Assign Role

Now that I see it, can I use the same field for avatar and logo if so how do I do it?

One more thing, which permission combination should I use, anything for anonymous users?

Thanks in advance.