RocketTheme Template Club are releasing two free themes this month and they are available for download from the RocketTheme web site. When you get to the site click on the 'free templates' item in the menu.
Andy Miller, famed for his Solarflare theme that comes as standard with Joomla is releasing ShowCar and Haiku Ramblings. Both themes are very clean and fast loading and are suitable for a blog or a product site.
Both templates us use the standard Joomla module positions so can be installed and implemented very quickly. Visit RocketTheme Template Club to download them.