So far so good here! Installed an upgrade over 10.2.8 and it seem to work fine. Will investigate more tomorrow, now I've spent a whole day doing backups, fixing harddrives etc to be sure nothing was wrong before the upgrade.
Only peevee so far is that it seems that the "grid" on the desktop is wider, even if I put my icons close to the right side the jump maybe 20-30 pixles to the left if I arrange the icons on the desktop. Not sure how to fix that. Any ideas?
Haven't figured out if I should use Expose with corners or short commands yet, I keep activate it when I don't want to... so I'll try a while with corners and if it's too annoying I'll just use the F-keys.
Also a tip: It can feel slow to search in the new finder windows, so go into the preferences and uncheck the box for iDisk and Network if you happen to use them. That should speed up things (especially if you have iDisk, not the fastest server in the world).