Where can you find the best templates for Joomla 3.0? Here of course! No, really, we have curated this list of templates and found the best ones. All are compatible with Joomla 3.0 (This site runs on Gantry by RocketTheme).
To tell you the truth, most come from some of our favorite template clubs. We just found them and thought it would make your search easier if we put together this list. Take a look and see what you think. Some of these templates are paid, some are free. If you found a template and you think we should add it to this list please contact us.
Now for the list :)
Mi Casa by YOOtheme

YOOtheme is a popular template and plugin developer for Joomla and WordPress sites. The Mi Casa theme has a fully responsive layout, provides 8 style variations, custom wedgetkit styles for slide-shows, flexible column widths and is built on their Warp framework.
Corp by JoomlaShack

Built on the JoomlaShack's Wright Framework. This template has 6 color styles and 12 collapsible module zones. Professional design with elegant typography.
Insurance by Template Monster

Insurance by Template Monster is a fully responsive template for Joomla 3.0. It comes with several different module positions.
Fest by Gavick

Gavick's Fest template boasts a creative music festival based design. Of course you can choose other styles to represent your website other than the default layout. It comes with responsive design, custom fonts, social api, the Gavern Framework, and some other nice features.
Magma Free

Looks like this is a pretty new release. There is not much information on it, but it appears to be free. Check it out!
SJ Joomla3 by SmartAddons

SJ Joomla3 by SmartAddons is fully supportive of Joomla 3.0 and all browsers. When you view the demo, you can see how it looks on all devices; computers, tablets and smart phones. Both in portrait and landscape view. IT'S FREE!
IT Future by IceTheme

IceTheme made a very clean and fresh FREE template for Joomla 3.0. This templates is not complete yet, but the creators promise to have new themes release for Joomla 3.0 as soon as possible. Keep your eyes out for them!