Yeah, I really like working with WB - its just so EASY to create new modules and get things done. I have tried probably every major CMS out there, and they are all either too kludgey, too complicated, too hard to write custom code for, too server intense for no justifable reason, or too crummy from a user interface aspect. (I had snipe.net running Mambo for a while. 6 months swent by, and I realized I couldn't upddate some parts of my site because I couldn't figure out how the heck to find them in the admin!)
I tested WB on the VACA Online site - the admins are ALL animal people (read: not very tech savvy AT ALL) - and THEY loved it. WB is the first real progress I have seen that blends good site optimization (search engine friendly urls, etc), pratically limitless module design and an interface that even the most technophobic users can handle. It does just what it promises, no more, no less - and I love that.
Oh, that reminds me... I forgot one...
http://www.animalissues.org - tho the woman who runs that org doesn't do much with it yet.