I'm really enjoying the Nokia N800 that I received from the Nokia Blogger Relations Program. Surprisingly, Nokia have made Linux almost usable :-) . Seriously, it's fast enough and does what it does well (of course what is the market for the N800? I think it's a great portable Linux computer for geeks and cheap phone and video call power users today!). I am not a big fan of the stylus so I am happy that you can use your fingers. Going to have to try to go a day without my laptop once I have all the apps installed (irc client, ssh client, and a few others).
I think that all major operating systems will be built on an open source core in less than 10 years. So why not build S60 on top of Linux instead of whatever it's built on top of now? Perhaps the N800 as atmasphere suggested in twitter is the one of the first steps to that.
In the long run, it makes sense given the introduction of Open C and Widgets on S60. If apps actually use these two APIs then they should mostly work if S60 were to switch to Linux.