@seanmcken: There is trojita-tp in my repo and some more under http://repos.fuhlbrueck.net/qt5-maemo5-examples/. Flatboat, sigil and otter-browser are actually somewhat useful.

Qt5 will not replace Qt4, all apps compiled with Qt4 still need Qt4. However you can recompile most of them with Qt5. Pure QML apps should be faster with Qt5, for all other apps it depends on several factors whether they are slower or faster. One downside of Qt5 is its larger memory footprint for Widget based apps and RAM a performance bottleneck of the N900.

@olibe: Looks like a similar error, I'll fix the postrm scripts later this evening. If this bug still persists tomorrow, please write again.