I hope that by intervening like this, the UN forces are not simply going to prolong the agony.
If we didn't enforce the no-fly zone, Gadaffi would win (govt forces better organised, resourced, more unscrupulous, etc). But they would win quickly. There would be limited bloodshed during the war, though there would be brutal reprisals afterwards. But, they would have had a huge scare and a few years down the line, they would have made a few small changes that might, just might, heve tipped the balance from making the ordinary people's lives change from unbearable to just bearable. If I was an ordinary Libyan, that is the scenario I think I would prefer.
As it is, this could go on for years now. The international community is not going to be satisfied with anything less than the death of Gadaffi and total regime change - whether or not that is their stated aim - because if he survives, not enough will change for the international forces to be able to say 'Job done' and pull out.
However, I am reassured slightly by the fact that the Arab League appear to be behind this intervention (though I don't know if they are actually taking part. If not, why not?). And Obama, wisely, has not given the lead. Cameron might find this comes back and bites him on the bum in the future, but at least this time the intervention is legal and widely supported.
As we have intervened, I think we should do it decisively and swiftly, and spare those poor, brave people a long, drawn-out civil war.