Thank you javispedro, I had no idea it could be that simple, but that's still a bit less information than I need, I'm not a developer.

"Download Enyo", OK - save it to where? What paths have to be changed? Can I follow the "preenv" HOWTO at http://wiki.maemo.org/Preenv/FAQ? Do I need to put a copy of Enyo inside every app package? Can I run Preware? Will the N9 be able to run the official apps from those US companies that don't give a sh... about the N9, like Box.net, Evernote, Pandora, Grooveshark, LinkedIn, Dailymotion, Khan Lectures?

It was you who did "preenv", right? I'm envious of people with an N900, is there any possibility of doing something similar for the N9?