lbt's blog (thanks, qgil) raised a good point that has bothered me for a while now. With all of its new telephony features, the N900 can be seriously exploited by hackers, and we're going to have to work as a community to, as qgil said, encourage Extras apps and discourage the use of random, unknown repositories.

Having seen how easy it is to make a silly app for Facebook and get everyone to use it, it sends shivers down my spine to think of how hackers could post an .install file that points to a malicious repository full of nasty trojans and exploits disguised as fun little games.