I recently took the plunge and have been using Ubuntu 7.10 on my home desktop for the past three weeks. I was somewhat content with Windows XP.
Read about the experience here
My Linux Experience
I've played around with Linux on the desktop in the past in a dual-boot configuration. My two other devices/computers are already running Linux. I have a web tablet, the Nokia 770, which is Debian-based. I also have a server running Fedora.