This is big: very big

The historical significance of what happened in Tunisia is huge.  This is the first time an Arab dictator is overthrown by a popular uprising.  It is too early to speculate whether this will or can spread, but I think one lesson is too obvious: the Arab people have realized that overthrowing a regime is much much easer than they had thought.   If the Iranian Revolution had an impact on Arab politics, this will certainly has an impact.

PS Jonathan is correct in reminding me about the popular uprising in Sudan that overthrew Ja`far Numayri in 1985.  But the dictator, `Umar Bashir, stole the revolution a few years later.