No, but I'll probably download it when it comes out from Beta and when I get the time to try it. I don't usually try Beta versions of Linux, I don't have the time to debug the problems with them. I try to stick with stable releases. There are a few bugs still on 8.10. This is one bug in the beta:" A problem that could result in corruption of the firmware on Intel GigE ethernet hardware has led to the disabling of the e1000e driver in the Linux kernel included in Ubuntu 8.10 Beta."
I upgraded to 8.10 last two weeks ago. I had to download the latest Nvidia driver from the Nvidia site (the drivers in the repositories didn't work). This is the only problem I had so far. I installed Gimp 2.6 (2.4 is included), I think I'll upgrade OpenOffice, too.