here is a person who has visited over 5,000 post offices in 49 states
http://colossus-of-roads.blogspot.com/
this one appears to be for postal workers
http://yourpostalblog.wordpress.com/
and the Letter Writers Alliance has been around for a while
many links at their blog
http://16sparrows.typepad.com/letterwritersalliance/
the missive maven, another letter writing fan who has been around for a while
http://www.missivemaven.com/2012/01/2011-year-in-mail.html
