Two Column Themes
Thematic is a two column WordPress development theme with widgetized areas above and below the content, Options for Multi-Author blogs and many other features.
Portofino is a postcard from the Italian Riviera – once fishing village, now resort of the rich and powerful who wouldn’t be seen dead in Monte Carlo next door. Portofino is also a 2 column fixed-width WordPress theme, with righthand sidebar, enabled for widgets.
Minimalist Vintage WordPress Theme, was created based on original theme for WebMinimalist.com. You can choose to make a site with Static Page on the home page or make regular blog as your home page.
Three Column Themes
Atari Command is a three column theme based on the arcade console. It has place for 155px images in the sidebar. EDIT: Link removed due to copyright complaints
A clean three column version of the Ndomche Summary theme. It has 4 sidebars – the single post has customizable sidebar of its own where you can place various widgets and so on. This theme includes no images — ads apart.