It gets better: at least two other al Qaeda leaders are believed dead, and one of them is al-Zawahiri's son-in-law. Here's the Reuters story:

http://today.reuters.com/news/newsarticle.aspx?type=topNews&storyid=2006-01-19T012818Z_01_SP13150_RTRUKOC_0_US-SECURITY-PAKISTAN-QAEDA.xml&rpc=22

Pakistani intelligence sources on Thursday identified three of four al Qaeda members believed to have been killed by a U.S. airstrike last week, though they have yet to recover the bodies.

One of the dead was said to be Abdul Rehman Al-Misri al Maghribi, a son-in-law of al Qaeda second-in-command Ayman al-Zawahri.

Another was Midhat Murfi al Sayid Omer, an expert in explosives and poisons who carried a $5 million U.S. reward on his head.

The third man named was Abu Obaidah al Misri, al Qaeda's chief of operations in Afghanistan's eastern Kunar province.