Hey everybody, this doing each individual step thing is quite the pain for those people who still have 3.0.0 available to them in Fantastico, etc. So what I've done is write up an update.php version that will update your database from any existing version to the current. You then simply upload the files to your web server and you're good to go. (skipping the global.inc.php and home.inc.php files of course) To help that, I even pull the contents of the global.inc.php for you and display them so you're sure to have an accurate copy in case you overwrite it.
And, since this file shows priviledged database access info, it is password protected. When you execute it, you simply use your superuser admin id and it will do the rest.
Of course make sure you have a backup of everything, but I did a 3.0.0 to 3.0.5 upgrade tonight in one step. It was very nice.

This of course only works with non-modded stores, but hey, that's still a LOT of people.
And without further adieu, here's the download link:
http://www.swscripts.com/downloads/upgrade.zipDownload link fixed -- Thanks Homer!