Although ultimately commercial, these links seem interesting.
http://www.selfesteem4women.com/index.php?ad=
http://www.retirement-matters.co.uk/gparchive/loneliness.htm
http://www.seniors.gov.au/internet/seniors/publishing.nsf/Content/Loneliness+and+social+isolation
Spanish speaking readerswill find these links quite useful.
http://revista.consumer.es/web/es/20011001/interiormente/
http://www.elmundo.es/magazine/m64/textos/soledad1.html
Some songs that tackle "loneliness are:
Goodbye my loneliness by Zard (will really make you feel on top of the world!)
Loneliness by Tomcraft / The loneliness by Babyface / Killing loneliness by HIM /
4 seasons of loneliness by Boyz II men / love steals us from loneliness by Idlewild /AND MORE
Here's one song, though, that stands high above the rest. The lyrics are beautiful, the music is lovely, the voice is so special - Gladys Knight - Help me make it through the night. I just Love it! She starts by dedicating it to "especially for all of you out there...." . (Try Elvis Presley's version too - http://www.youtube.com/watch?v=U2yMPsAsHQY