There is a new plugin at WordPress and it will allow you to assign themes to posts and pages. Want one theme for your main site, a different one for your blog and a third one for your shop? Using jonradio Multiple Themes you can do that and still manage everything – your site, blog and shop, with one WordPress installation! You could even use one theme, but tweak it for different content sections of your site!
There are some problems with some paid themes, apparently, bu the plugin has great reviews. Contact me if you’d like a walk-through of this cool plugin!