BlogTimes is an old school Newspaper style WordPress Theme, based on a three column fluid layout, enabled with cufon fonts with beautiful typography for the headlines, options panel, and a custom front page slider.
Dark Tuts is a very clean WordPress theme that has been designed with blogs in mind. This theme has an HTML5 doctype, clean and valid code, 3 color schemes (blue, green, red), 3 different ways to add post thumbnails, the ability to change thumbnail sizes via the theme panel, 1 advertisement spot and tons more features.
Quick-Vid is a simple blogging theme with slick design elements.
Semanu is powered by the 960.gs css framework with multiple widgets and a 3 column layout.
Syailendra is an adsense (advertising) ready theme with multiple widget positions, threaded comments, theme options, drop-down menus, and custom menus.
WP Perfect is a two column SEO optimized WordPress 3.0 ready theme. The theme has a jQuery-based options page that lets you change basic settings easily.