I've got my N800 for over half a year now and I must tell I have been extremely satisfied with it - until I updated to OS2008. Here's why:

1. The Internet browser is more sluggish than in the OS2007
2. The browser tends to hang the unit more often than in the OS2007
3. I cannot pair my SU-8W bluetooth keyboard anymore -it just doesn't work
4. Navicore Personal navigation software does not work anymore
5. I lost all my internet radio bookmarks from Mplayer

So, I'll be switching back to OS2007 and keeping it until those bugs are fixed. I like to use the keyboard and yes, the navigation is handy when getting to new places. Or, if there are simple workarounds from people who already have solved those problems, I might consider using the OS2008. For now there are just too many cons and too few pros to keep the newest OS.