regarding the finale...from Weiner some time back...
quote:
"Mad Men is not Lost or even Breaking Bad. There will be a whole story told, but there is no mystery to be solved. All I can tell you is that we made it one episode at a time. And, of the seven years, there are at least three of those seasons where the season finale I thought was possibly the series finale. So I've ended it before."
Leads a lot of credence to the idea that the ending will just be another moment of Don entering his vicious cycle. Whether that is with a new woman, or simply walking into the office after resolving some sort of issue, with the company and/or Don turning the page to whatever is on the horizon.
and for guessing what season finales those would be...I'd say 1, 2, 4?
1 and 4 for sure.