The development and testing repositories have those names for a reason. Do not install applications from those repositories if you require your device to remain stable. I don't really use my N900 as a phone, so I can afford to tinker.

Also, as a developer, I don't really want newbies installing my application(s) from extras-devel/testing. It just causes headaches for all concerned and doesn't provide any really useful feedback, which is what those repositories are for.

I wonder which search query would return the greatest number of results. My guess would be 'plz help?????!!!???!!!!!!!'.

/rant