I've been using Joomla! since it wasn't called Joomla! but more intensely over the last few years after setting up BarclayWorks. I'd consider myself an expert novice user and love the fact that there is always something more to learn, especially at the moment with the advent of a new version.
I'm an active participant in the London Joomla User group. If you would like to know more about this: http://www.joomlalondon.co.uk/