It started as an experiment.
Over the past twelve months Ubuntu it stopped being an experiment and became my modus operandi.
Was there a singular epiphany for me? I don't think so. It felt more like watching the sun rise a few times, with each installation. On my notebook, I've done fresh installs of Karmic and Lucid; and the Meerkat upgrade. My daughter has UNE on her netbook.
Many thanks to the Ubuntu community.