Need a way to see what "extended" blogs are expiring

It would be really helpful to be able to see who's supporter periods are about to expire and need renewal.

Obviously, most members are on an automatic paypal renewal. But, in my community, we've provided quite a few free trial periods by simply extending a members' blog.

I'd like to be able to see who is about to expire so I can solicit them for a subscription before their supporter features are turned off.

It might also be worth while to add some sort of countdown to the dashboard of an extended blog so that they are aware of their pending expiration...

Thanks!