This gave me a cheery laugh.

OrangeBox, the prison doors are wide open and there is no key. For the N900's predecessor, people have gotten (with varying degrees of success) Ubuntu, KUbuntu, Android, and Windows 3.1 running, to name a few. That's not including all the emulator options available. I am currently dual-booting my N810 to Mer, which is basically a community-controlled (not Nokia-controlled) version of the N900 Maemo software. If you watch these forums over the next year or so, I'm sure you'll see lots of people pushing the boundaries.