Welcome to the forum!
Yes, there are a lot of folks out there doing this, and it has its own terminology, because standard monogamous models don't work to describe some of the relationships and issues that we have.
Do you know if there is a local poly group close to you? The absolute best way of getting to know folks that "get it" is to go to some of these. There is a Yahoo Group specific to your state at http://groups.yahoo.com/group/OKPoly
but I can't speak for how active it is - maybe they arrange get-togethers.