Michelle has a good round-up, as does the Counterterrorism Blog.
Captain's Quarters has more:
Where has Egypt stationed its soldiers in any of these areas? Nowhere. Why does AQ want to attack Muslims in Egypt if the country doesn't have any soldiers deployed to Iraq? Because Iraq has nothing to do with Al-Qaeda's overall war. This attack should make that obvious, finally.
Egypt has no patience with radical Islam; Hosni Mubarak sees it as a threat, and rightly so. Radicals killed his predecessor for signing a peace treaty with Israel and Mubarak has maintained that diplomatic contact. He has managed thus far to checkmate the radicals in Egypt, mostly through political oppression that has the deadly side effect of oppressing everybody, creating more radicalism. For example, Osama's number two man, Ayman al-Zawahiri, hails from Egypt and used to head the leading radical terrorist group there before it folded itself into AQ.