Siobhan,
A canonical authorization scheme looks like that:
- users
- groups
- roles
- permissions
Majority of the portal vendors use this scheme. This scheme is adapted by J2EE, .NET 
as well as all major Database and LDAP vendors. We also use this model. It's highly 
flexible and covers all practical requirements.
Regards,
Peter Kinev.

"Siobhan Thomas" <[EMAIL PROTECTED]> wrote:

>We have a news-type website and I'm having a look at the way our membership sign 
>up works--web only member, paid members, etc-- (and how member details are 
>maintained i.e. allowing members to update address, other details) and am wondering 
>if you know of any sites which you feel handle this particularly well. Maybe it's the 
>shopping cart, or maybe its just the design/ layout but I'd be interested to hear 
>your 
>thoughts.
>
>Thanks
>sio
>
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