CNN actually comes up with a fairly good analysis this time (bold in original):
What similarities are there between the situation in Egypt and that in Tunisia?
Both nations have seen dramatic rises in the cost of living in recent years as well as accusations of corruption among the ruling elite.
Egyptian President Hosni Mubarak has now been in power since 1981 — six years before ex-Tunisian ruler Zine El Abidine Ben Ali, who was forced from office earlier this month, assumed the presidency of his country.
The protest movements in both nations have also been characterized by strong middle class elements. No surprise then that the dissent in Tunisia has inspired some demonstrators in Egypt.
As PJM’s Vodkapundit, Stephen Green points out:
Just because the middle class joins a revolt, doesn’t mean it will become a successful revolution. But I’m hard-pressed to think of a winning revolution where the middle class wasn’t participating.
A very good point, I think.