Addr.co is a free (no ads!) link shortener with custom links and 301 redirects (Moved Permanently). All links are permanent. Addr.co is fully compatible with Facebook and Twitter. Additionaly you could trace your link's visitors number day by day. All statistics are world readable and could be found using this URL:

http://short.addr.co/stats/xxxxxxxx

where xxxxxxxx is your unique site's identifier.