I have been worried about KDE 3.5.1 in Kubuntu Dapper lately. It still has a lot of (major) bugs, like not being able to print or having Kontact lose all the contacts from kaddressbook when closing the app with a mail opened.
Now lately we have been fixing important bugs so I’m less worried. There is still some work to be done to make Kubuntu Dapper a nice and usable distro, but at least it feels this can be done in the month that is left 
I actually hope we don’t get to integrate KDE 3.5.2 in Dapper 3 weeks before release, otherwise I’m afraid we’re going to face a hard bugfixing time.