Let's document the progress and conclusions on this page.
The initial problem here was that the QML components in MeeGo made bad assumptions about the directions provided by Qt Mobility.
This is fixed in git (not yet in the repos), however, there is an additional problem in that it 'fixed' itself before being integrated in new images.. so something may have changed in the n900 sensorfw stuff or something. Needs investigation.
This is significantly eased by Robin's patch to drop GL contexts when switching applications (saves ~10mb per application), however, this causes a visual glitch at present (see http://www.youtube.com/watch?v=Oy10RPxLEn4) so this won't be submitted upstream until it is fixed. It is still usable, however, so perhaps the DE can cherry-pick this patch in for the time being.
Thanks, Qt Mobility.
Kickstart files for tablet will be available in following gitorious tree: https://gitorious.org/meego-developer-edition-for-n900/image-configurations/blobs/master/tablet/
Some ready made images area available in http://meego.openaos.org/ -> n900