I should have done this before reporting the bug of course, but as I had
vague memories of acceleration working when trying out an earlier live-
cd version of ubuntu "long ago", I downloaded the 5.04 Live CD and tried
it out. And it did indeed have working 3D-acceleration.

Comparing the logs seemed to point at the difference lying in 5.04 falling back 
on pci for the dri, so I added:
        Option          "BusType"               "PCI"
to my xorg.conf.

With this option added, 3D-acceleration (including compiz which I'm
using at the moment) seems to work just fine, and glxgears (the beloved
benchmarking tool ;) ) reports fps about 10 times higher than before.

So. Bug closed?

(is there even any use in reporting possibly ppc-specific bugs?)

-- 
No or broken 3d-acceleration with Jaunty on ibook/powerpc
https://bugs.launchpad.net/bugs/354677
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