I added a YackPack WalkieTalkie widget to BlogSafer.org, the anonymous blogging wiki. With PBwiki you can drop it in as a plugin. Now, if you visit the site, you can talk with one another.
I also put one in this blog’s sidebar.
Update: I figured out how to put one on our co-located Chinese anonymous blogging guide, chnblggr.
(Full disclosure: I’m currently working for PBwiki.)