Connections Reloaded is a complete reload of the highly popular and extremely beautiful Connections theme by Patricia Muller. Connections Reloaded 2.0.1 is a two column, widget and Gravatar ready theme. Includes few inbuilt widgets as well as many page templates.
Ginseng Coffee is a three column, brown, widget and Gravatar and tag ready theme.
2 columns, widget ready, right side bar, with Ajax picture viewer enable
A simple two-column WordPress theme with a small splash of color.
While on the topic of themes, you might like to take a look at Building with WordPress: From sketch to prototype to company website in 5 hours and Collapsing WordPress Widget-Ready Areas & Sidebars and Show latest comment(s) for each post on main page.