Muammar Gaddafi seems intent on sealing his own fate. Numerous accounts claim that, despite calling an immediate ceasefire in response to a threatening UN Security Council resolution, Libyan military forces are proceeding to assault Benghazi.
If so, the "no fly zone" becomes irrelevant and Western air forces will proceed to dismember Gadaffi's firepower assets - his tanks, artillery and air defence hardware. A scan of Libya's order of battle shows that most of his stuff is obsolete and the small fraction that is remotely battleworthy can be quickly reduced.
Maybe, just maybe, the old bugger has decided to go down in a blaze of martyrdom. Maybe he's just crazy. Either way, he's finished.