Puppy Linux woof!
I'm an Ubuntu linux user, as it's widely supported, easy to install, and a breeze to update software using Synaptic. I do admire other distros (I've a soft spot for the vehemently Free multi-media dynebolic, the audio-rich pure:dyne (made by goto10), the minimalist ubuntu-based #CrunchBang) and since acquiring the snazzy Acer Aspire One netbook, I'm always on the look out for lean and mean linuxes.