How to accept voicemail on your blog?
Looks like GrandCentral will do this when it fully launches (http://buzz.blogger.com/2008/01/grandcentral-receive-calls-and-post.html), and Odeo used to do this but the link is now broken (http://labnol.blogspot.com/2006/03/let-site-visitors-leave-voicemail-for.html).
Evoca (http://www.evoca.com/) does this, but its offering seems too complicated and it always scares me when a service so simple doesn't publish its prices publicly.
GetABuz.com is down right now -- I don't know if it's permanent or just a tech snafu.
SnapVine.com is being acquired by WhitePages and makes you use an ugly, SnapVine-branded widget.