sudo dpkg-reconfigure gdmdoesn't seem to do it. I shall have to try fiddling around in /etc/X11. (Later - ah this is gdm,it just looks rather different and at the monent has no, well not many, options on configuration).
Before the upgrade I was using firefox 3.5 which wasn't the 'official' version, post upgrade, 3.5 is official but the browser has my bookmarks/saved tabs and passwords from 3.0 and the ones from before are nowhere to be seen! A colleague has expereinced issues with an identical ASUS laptop and the nividia driver for the G9650M GT graphics card. It seemed to be ok for me but once I started something kde related, I too, got graphical artifacts (junk!) all over the screen. Known bug with the latest nvidia driver and that card (happens on both Linux and Windows) and they don't appear to be in a hurry to fix it. I shall try keeping away from kde and see what happens! My other photo from the evening is here.