It would be very useful if users could subscribe to certain dumps and be alerted when new dumps were completed and available. Ideally this would be an on-wiki alert, however other alert mechanisms (email, RSS, etc.) would also be of use. Subscriptions at either the project level or the dump level would be best.
I wasn't aware of the RSS feeds, they do what I was looking for. The only thing which could make this better for my purposes would be for them to send a wiki notification, but I can certainly work with the RSS.