Mac OS X 10.3.9 has been released, and will be the final update before Tiger is officially available. It appears that Apple fixed the font issue documented at daringfireball.net about three weeks ago. The software update KnowledgeBase article (delta updater) states:
Addresses an issue in which the startup time in Mac OS X 10.3.6 through 10.3.8 may be extended if a large number of PostScript fonts are installed.
I’ve successfully installed the update on two systems and haven’t had any problems so far.