Check it out!
I just found this, but it might not be a surprise to you all as I tend to be a bit slow on the news. Anyway, it's a site put together by brilliant folks to showcase the many, many, different WordPress Themes.
Look at the very top of the screen for the Theme Switcher. It's almost invisible, which is nice because you can concentrate on the Theme and not the switcher, but hard to see because it's so light colored. Pull down the menu on the upper right and select a theme. You can click around to page, category, archives, etc., to test drive the different looks for each theme. Very cool.
Thanks to all who put this together. It's a wonderful resource for putting all the different themes through their paces!