I've been a Joomla head for quite some time now. I've tried out a number of other CMS over the years and I kept coming back to Joomla.
I don't know if it is because it has the largest support community of any open source CMS, or if it is because of the large amount of plug-ins for it, or what.
All I know is that Joomla rocks!
yeah joomla is great :) but do not forget to take back-up, when I first started to use it collapsed 3 times because I think I made some wrong actions... :)