Strategy page has a summary on the Zimbabwe situation. I have found their analyses insightful in the past, so you might want to go to the link and read the whole thing.
Summary: Mugabe is clamping down on his political "enemies" again, and the Jasmine revolts against dictators has scared him.
much of it is known by those of us who are following the situation, but they note rumors (unconfirmed) that some of the African mercenaries that are helping Libyan dictator were sent by Mugabe.
and they worry:
"National elections are looming, political violence is increasing in the major cities, and Robert Mugabe remains very much alive. If Qaddafi survives in Libya will he send commandos to help out Mugabe?
what might save Mugabe, of course, is the same thing Strategy Page has noted about Iran: That the best and brightest, who might start a revolution, have left the country already...