A Seattle man, James Ujaama, pleaded guilty this week to aiding the Taliban while they were sheltering Osama bin Laden in Afghanistan. Ujaama, a Muslim convert, admitted conspiring to send the Taliban money and computers. Under a plea deal, prosecutors agreed to drop a more serious chargethat Ujaama plotted to help open a terrorist training camp in Oregon. Ujaama promised to cooperate in other investigations. Prosecutors believe he can help build a case against Abu Hamza al-Masri, a radical London cleric believed to be al Qaidas top terrorist recruiter in Europe. Ujaama ran a Web site for Masri, who has openly supported bin Laden and praised the Sept. 11 attacks. In retrospect, Ujaama said, I did do some incredibly dumb things.