It is amazing how the concept of peaceful protest is eroding in the Arab world. Unfortunately that also means that its effectiveness is fading.
The original Gandhian idea of peaceful protest is to do something that is entirely within the laws of the country - no matter how repressive they are. That way the regime has no excuse for arrests or violence - unless it gives up on its own principles. And even when protests cross the borders of the law as understood by the regime they should restrict themselves to minor transgressions that normally are tolerated or just punished with a small fine.
As we can see in Libya and Syria it is impossible for protesters to win from a well-organized regime. So they shouldn't try. Instead of asking for regime change they should make reasonable demands like less corruption - including the removal of some corrupt officials - and more freedom.
The power of protesters in making a moral point strong enough that the regime feels pressured to give in sooner or later. The more disciplined and moderate the way this point is made the greater its chance for success as one of the main arguments for a dictatorship is always the supposedly undisciplined anarchic character of the masses.