Spettro is the latest theme from SlackrThemes. It is a minimal and brightly-colored theme, very minimal, and has a creative look to it. The whole site is aligned to the left with a bit logo at the top and a widgetized sidebar (login form hard-coded into sidebar.php). Also a recent thing that I am including with all of the themes now is a canonical links for comments hack which will reduce the risk of duplicate content, which is one of the major problems with websites and SEO.
-It’s aligned to the left!
-Thumbnail-enabled (added in WP 2.9)
-Very minimal, easy to change logo/background
-Gravatars in comments