Actually, I take it back, I just solved it for my computer.  Apparently the 
typing delay was just an extreme instance of the generally slow video 
performance of my Intel 865g (82865g) processor with the Mesa drivers.  I'm 
trying to figure out how to switch to the Intel drivers with Intrepid, but in 
the meantime simply adding:
        Option "AccelMethod" "exa"
        Option "MigrationHeuristic" "greedy"
Under the "Device Section" to my xorg.conf made a HUGE difference, and now 
there is no delay!
Which reminds me, I should note that the bug that makes it so the default video 
drivers assigned to the Intel 865g have such awful performance is a pretty 
nasty one.  I almost gave up on Ubuntu on this computer, until I found the 
helpful forum post suggesting the above change.  Sadly, I'm sure a lot of 
people will just give up when the video performance makes the whole system run 
so slow...
Thanks!
Jesse

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Thunderbird typing in compose window is occasionally very slow
https://bugs.launchpad.net/bugs/155547
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