Okay themes, one of the top premium themes developer is having a sale going on for a limited period 2012.
They have release few more themes and that makes around 20 themes in their catalog. They have themes ranging from wp themes, tumblog themes, html templates, landing pages, blog themes and Genesis child themes.

okay themesThe main benefit is they are responsive themes, adapt to iphone, ipad and mobile phones and other tablet screens. 🙂
Responsive design allows for users viewing websites on mobile devices to access them in a more user-friendly manner. Basically, these new themes look great on your iPhones, iPads and other inferior mobile devices. Currently Rewrite, Slate and Radius are responsive.

Checkout all the themes here – okay themes on themeforest.