Violence in Syria is increasing. Over 1000 people are dead making it the tied second/third most violent revolution with Yemen (after Libya, though much less so on a per capita basis). Syria is roughly tied with Yemen for deaths.
This confirms my hypothesis about two types of revolution (violent and nonviolent). It looks like Syria is suffering from the lack of an existing democratic/reform movement (which was most notable in Egypt) and this is making the revolution very violent.
The revolution in Yemen is also getting more violent (currently around 1000 deaths). However Yemen seems to have a much larger break in civil society than Syria with major leaders joining the opposition movement. Yemen has a better chance of a democratic transition (Intrade has the Yemen president at a 80% chance of leaving by the end of the year, whereas Syria is around 30%).
Obviously there is a continuum between violence and nonviolence in all the revolutions. Even while Bahrain was being very nonviolent they still had 4-10 people who died.
I hope that as nonviolent as possible revolutions will mobilize the maximum number of people and lead to democratic transformations.