Last night I upgraded my laptop's o/s to the new Ibex 8.10 release, not yet official still in beta but so far very stable.
This can be done via,
sudo update-manager -d
...then choosing the new distribution 8.10 from the top of the update manager dialog, you'll need about 1 hour for it to download & install. Be around for some of the dialogs; one of which will ask you if you want to merge or replace your network script (i clicked merge) after which you should be ok.
It comes with a lot of new updates and a major interface overhaul.
There's now a fallback linux kernel if the main one should fail (like ArchLinux), more windows-like logout panel, better hibernation and a new theme called NewHuman (see screenshot above).
Along with this there's available from the repository,
...and a ton of other newer packages, Mercurial is also updated along with the Kernel so any new hardware should be properly recognised.
After the install I had to reboot obviously, on rebooting my wifi no longer worked, so after another reboot that came back. Did an update & upgrade for any newer packages and so far other than the battery indicator applet crashing a couple of times nothing majorly serious.
Eclipse is still at 3.2 in the repository, along with NetBeans at 6.1 so that's a little bit of a bummer. However NetBeans does come with an easier installer so just grab the latest nightly build for that, Eclipse Ganymede and 3.2 are proving a little flakey at the moment.
Interface-wise it is a heck of a lot better than the previous release and although unofficially available I would recommend grabbing a copy, definitely worth the effort.
Just done an update,
Did have a problem with the NewHuman theme, after doing a safe-upgrade I lost the theme, although I did find a replacement;

..you need to download the Murrine debian package for the distro you're using, install it, then download + install the Dust Theme.
Other than that this release is shaping up pretty nicely!
Found this good guide to replacing OpenOffice 2.4.1 with the latest 3.0 release, pretty simple.
Basically add this to your repository then update and upgrade & you should have the new build.
deb http://ppa.launchpad.net/openoffice-pkgs/ubuntu intrepid main
Add this to your repository to grab Firefox 3.1
deb http://ppa.launchpad.net/fta/ubuntu intrepid main