I just finished a major project for Tom Watson, author of CauseWired, converting his website, onPhilanthropy.com, from a custom CMS to WordPress. The new site is built on the Arthemia Premium theme with modifications enabling it to carry ads from multiple sources.
This site was a blast to work on. I had done a couple of other small repair and rescue jobs for Tom. He is wonderful client; tech-savvy and patient, he pushed for solutions that stretched my skill set and forced me to learn new techniques. Some of the interesting features of onPhilanthropy.com include: customized widget headings, a revamped advertising manager, a Twitter slurp and feeds from companion sites such as, DotOrgJobs.com.
If you are in the dot-org space, please visit onPhilanthropy and check out how good technology can advance good causes. And, of course, feedback is always welcomed.