Ari is a minimalistic, flexible three-column blog theme for WordPress by elmastudio.
The theme makes use of CSS3 media queries for its flexible layout and is optimized for tablet pcs and smart phones (the theme switches to a two-column layout when viewed on a horizontal iPad screen, and to a one-column layout on iPhones). You can also choose a dark color scheme and the backgound-, text- and link-colors can be customized in the theme options page.
Theme homepage: http://www.elmastudio.de/themes/ari-wordpress-theme/
Download: http://wordpress.org/extend/themes/ari