And now, there's the Ubuntu Open Week: https://wiki.ubuntu.com/UbuntuOpenWeek
I'm running my Desktop, my Notebook and two Workstations on Jaunty. I like it's short boot times and some ACPI improvements that 2.6.28 brings (mostly on the Notebook).
I like Jaunty just as I did like Intrepid. After Hardy had been a disappointment to me (on the desktop) concerning the stability, I found Intrepid to be a necessary stabilizing release.
I've been running it on my laptop and desktop for a while now. A few things I really like:
-The Ayatana project's use of the new notification system. It's clean, simple, and functional. Hopefully it'll be themeable soon enough.
-Improved driver support. It's easier than ever to ensure that components work.
-The new themes are great, a huge step forward.
-Seems more responsive than the previous release.