Instead of putting too much cluttering text and way too many images here I would like you to check out http://www.h4x3d.com/themes/feather/
the past three months I have worked on wordpress theme community project (besides university) with its final product, a free -some would say?- "premium" wordpress theme, which is (by what I believe) very unique (it does not really look like wordpress, does it?)
it is called rainbow feather and is the third version (revised version) of the famous theme released by me in june 2007 which received over 25,000 downloads.
it is available in six different languages, is xhtml and css valid and looks all the same in every major browser to
date. it has a complex code under its hood, such as trimming too long titles, built-in lightbox using the ultra light and small moo.tools framework, widget-support in the footer and so on.