Just updated the site to Joomla 1.7.
Development went very smooth and the learning curve from 1.5 to 1.7 wasn't really difficult. I'll be testing new extensions over the next few months, mainly to see if I would use them on any of my clients' site.
The next upgrade to Joomla is coming at the end of the month. From all my reading it should be a very easy upgrade.
Stay tuned for more