I've been an Ubuntu user since Dapper and Ubuntu has been my only or main OS since Lucid. My PC is not powerful enough to run Unity so I use Gnome Classic and since Precise I've started fiddling with LXDE too. My favourite release thus far is Maverick though Precise built up from a minimum install with LXDE is a close second.
A very big thank you to all who contribute to Ubuntu.
Before Ubuntu (and during) I often fiddle with Fedora and I've sampled a few other distros. My first Gnu/Linux use was in the late 90s with Red Hat and then Suse.