qtopia is not an operating system, it is not a linux distro.

qtopia-core (previously qt-embedded) is a toolkit, for graphics, text, sound and input methods. Qtopia is a user interface built on top of that, just like KDE is built on top of qt3.

so, all you'd need to do is download (and there's a GPL version) the qtopia source (which includes qtopia-core), built it using cross-compilation tools for the arm processor, and install it on the n800. OK, easier said than done.

Now, if you wanted to run zaurus applications, you'd have to build qtopia-1.7 with qt-embedded 2.3.x because that's what Sharp used.

If you wanted to run Mylo apps, you'd need qtopia1.x as well as qtopia2.x 'cos it seems to use both.