require 'xmlrpc/client'
#建立server
begin
	server=XMLRPC::Client.new2("http://www.jiangmiao.org/blog/xmlrpc.php")
	server.call("wp.getUsersBlogs","admin","blog密码")
rescue
	puts $!.message
end

运行后返回我的blog信息

blogid  1
blogName        江淼的Blog
xmlrpc  http://www.jiangmiao.org/blog/xmlrpc.php
url     http://www.jiangmiao.org/blog/
isAdmin true
--------

就是这么简单:)