You can now add a little country flag by your name (it appears at the end of your "location"). You need to have entered a location to enable the flag:
http://www.civinfo.com/forum/profile.php?do=editprofile
You can also search by country in the member list - when looking at the memberlist press Search Members, then Advanced Search:
http://www.civinfo.com/forum/memberlist.php?do=search
allflags.jpg
The 2 letter country codes are detailed here:
ISO country codes table