I have a client who owns a chain of clubs around the world, and wants to have a separate Wordpress site for each location (it can be WordpressMU). Each site will have a subscription box where non-registered users can signup to receive daily-digest updates from that site. So far, the subscribe2 plugin could be used for that.
The tricky part is he wants visitors to be able to choose from all of the locations when signing up for updates. So for example, let's say a visitor on the Las Vegas site wants to get updates, but since he travels Miami quite a bit, he wants to get updates for the Miami location, too... he'll be able to choose to receive updates from those two blogs. The details of implementation are still fairly open, but I'm imagining maybe a "locations" button that opens a little box with checkmarks for all the locations. Something like that, but the important thing is the functionality.
Does anyone know of any scripts that will do anything like this, or maybe have any ideas or recommendations?