Bold Web Elements UI Set
This web elements set has bold typography and features very rounded corners as well as square corners. This UI set is perfect for darker websites but can also work well on sites with a lighter color scheme. Included in the set are editable PNG and PSD files. The files are layered, named and elements are grouped, so you should find it pretty easy to work with.
The fonts used in this set are League Gothic (available for free here) for headings and bold text and Verdana for copy.