Number of quality free themes is not as high as it was, and best themes are premium ones. But from time to time, you can find a real gem like this FolioGrid theme. Clean and simple design, use of jQuery for various transitions, 3 color schemes and more.
Another great free theme release through the Smashing Magazine webiste, beautiful and dark theme with 3 color schemes, ajax based contact form, several jQuery usability elements and small options panel to select color style.
One more free theme, but with great design that is inspired by the iPhone interface and iPhone Notes application. Supports all current WordPress features including threaded comments, and has many details that make the theme look great: drop down menus with shadows, social media buttons and more.
Another great find on SmashingMagazine. Excellent simple WordPress portfolio theme with clean design and many great elements. Not many options on the control panel, but overall great theme.
Great simple and free theme that comes with 4 built in styles you can control with options panel.
