I forgot that there was an update for WordPress, followed the regular procedure. I forgot more: while copying data over from one directory to the other I noticed that I missed too many files: Uh, I missed the -R.
Then after logging in I saw I had forgotten to turn off the plug-ins, something that is highly recommended before you even do the upgrade. I think I forgot this the last time too, to find out that it doesn’t really harm anything to leave them on. I guess, it depends on the scripts you use.
And last but not least: there are so many new things in 2.2 that even I haven’t found them yet (that is, unless you look at WP’s bugtraq pages). Don’t ask me to update CommentCentral just yet.