Just ran the WordPress Automatic Upgrade plugin here on bram.us and worked like a charm (upgrade path from 2.0.3 to 2.2.2).
Minor issues were that none of the links to “the next step” were correct when doing the manual steps (everywhere the crucial “edit.php” was missing in the URL) but that was easily fixed; and the fact that the link to the database upgrade script was wrong (because I’ve installed WordPress in its own directory, as explained in the codex) which was easily fixed too.
Yes, i’ve e-mailed the author of this awesome plugin about this.
Just did the upgrade to 2.2.3 via the automated version which doesn’t suffer from having the wrong URLS (viz. no missing edit.php’s in the URL), except for the database upgrade script which still remained wrongly linked …