I recommend creating a smart list called Marketable that is defined:
Email Address is not empty
Unsubscribed = False
Email Invalid = False
Blacklist = False
Marketing Suspend = False
Use that list as part of the smart lisf for all your outbound campaigns to limit the number of unqulified leads showing in the schedule tab.
The scenario that would be left showing up would be Elliott's last bullit point.
Qualification Rules are a great tool. They are asking "How many times is Jane Doe allowed to go through this campaign?"
Hope that helps.
I find it keeps reporting cleaner for all outbound email efforts.