Not a big one, but would be a useful feature -
Currently, when I'm working in the subscriber pane of one client and then switch clients it takes me to the new clients dashboard.
Now I'm guessing for a lot of CM users this suits their workflow, but for others it would be awesome if it would behave much in the way Google Analytics does, switching to the same page for the different subscribers.
This would be particularly useful with templates for example: if I'm uploading revised templates for a number of clients, it'd be great to be able to jump between the templates page of each client without having to drill down through the dashboard each time.
As I said, not a big one, but thought it was worth a mention. :)
Good call Mitch, this was originally the way we planned on having it work, and we may well move to this model in the future. Thanks for the suggestion.