Habr-gem is a project mainly written in Ruby, it's free.
This is a habrahabr uer data API gem.
API is documented here: http://habrahabr.ru/info/help/api/
require 'rubygems'
require 'habr'
user = Habr::User.find_by_name('4pcbr')
puts user.login # output login: '4pcbr'
puts user.karma # will output current user karma
puts user.rating # will output current user rating
puts user.ratingPosition # will output current user position in rating table