Jean-Baptiste Jung, web developer and the blogger behind WPRecipes, has released a few WordPress themes for free on his site: jQuery Mobile, Snippet, and OpenBook.
jQuery Mobile is a mobile WordPress theme built on top of the jQuery Mobile plugin. Snippet is a Thematic child theme, and is in use by Jung on his site PHP Snippets. OpenBook is a magazine theme that was initially released in 2008, is now listed as “100% compatible with WordPress 3.0 and higher.” Each of the themes, however, does throw an error or two (deprecated functions, mostly) using the Theme Check plugin.
All three themes are available at Jung’s site. Paid support can be requested there as well, though all three themes can be download for free.
You can follow Jean-Baptiste on Twitter