Canonical has now released Ubuntu 8.10 Intrepid Ibex. For all the good news you can read the news release on the Ubuntu website, as well as the release notes. You can also get a graphical overview of the new features in Intrepid, and of course you can also download a disk image of the final release to check out at your leisure.
Mark Shuttleworth has posted a nice article to his own blog about the design for the new user switcher, although I did notice that it seems to be hooked into Pidgin to show my current IM status. Although not everyone is entirely thrilled with the new Ibex.