I gave Ubuntu 7.10 AMD64 a fair try on my workstation mainly as a curiosity, and while it was somewhat usable (and Compiz Fusion was very nice and relatively bug-free) there were too many issues for ...
To make a long story short, I have WinXP and Red Hat 9.0 installed on the same hard drive in my laptop. Previously I had been using the GRUB bootloader to choose my OS, but I had to re-install Windows ...