The next paypal plugin release will support subscriptions. When a user purchase a membership, he will be added to a subscribers group (configurable) for a certain period (configurable).
Subscription can be for 1 day to 999 years and more. An email will be sent to user 7 days (configurable) before the subscription end. Another the last day and another the day after, when the user will be remove from the subscribers group.
With this feature you can sell access to your content or manage your association memberships.
Demo site
::Ben
I'm available to customise your themes or plugins for your Geeklog CMS