Nash,
That was an interesting comment about personal isolationism. I have found myself in a form of that for some time since I got my divorce. I have a fiancee but she lives in Brasil so there is a lot of time between "visits". We do engage in great conversation on MSN Messenger and in a lot of ways that is very much like being with her.
I also just joined a church. I realize that you probably wouldn't be interested in doing that but for me it was a great experience. I had distanced myself from the church for some time though I contnued to be a very religious person. Not bible thumping and in your face religious, it just has always been part of what makes me tick.
The church I recently joined is one that my family has been associated with for a very long time. My grandfather was a pastor there for 20 years in the 40's and 50's. They made me feel like a prince when I joined them. My mother is currently a member there.
Perhaps church is not your bag of tea, but there is bound to be some good social organisation you can join to get yourself out and about e reduce your feeling of isolationism.
Good luck.