|OT| Recommendation on membership registration system ?

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My sourceforge search isn't turning up much that looks appropriate, or has not
been abandoned.  Does anyone have a recommendation based on experience for a PHP
/ MySQL site membership management system ?

Requirements are fairly basic:
- After the existing credit card processing system approves membership purchase,
info will be fed to this system.
- Multiple (two, perhaps more) site user accounts per registration
- Restricted access to certain membership pages
- Ability for logged in members to view membership list
- Automatic renewal notification via e-mail; I imagine a cron job will handle
- Forgotten password reminders

Nothing unusual is needed, so I figure there's no point in rolling our own.  And
a full-fledged system like postnuke feels like overkill.

I'll appreciate any and all recommendations (or warnings) that can be offered.


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