I started to use Joomla 1.7. I found there is a lot of different aspects from Joomla 1.6. Some components are not working. All of templates I tried are not working in my Joomla 1.7 websites. Those templates are working fine in Joomla 1.5. I think Joomla group to consider deep on the backward compatibility. Thus, if you find a template, please make sure that is for Joomla 1.6+.