Finally I installed Tiger. I had the idea to wait until the first update is released, but as there where no complaints about compatibility with my standard apps I did it. One annoying thing I noticed was QuickTime 7 engrosses OpenOffice’s».sxw«-files and assignes them as MPEG-Movies. Also – as many others already wrote – all standard assignments for the default appliocations are gone. The update itself went smoothly and had no negative side effects (so far).
Since I do not use Apple Mail the only application where I have to deal with the new toolbar is NetNewsWire. I guess we all will get used to the new design.
Update: Since OO apparently does not work under Tiger, the mapping of ».sxw«-files to QuickTime Player makes sense ;-)