I did it last year, and really got lucky with little effort.
I had a best friend throughout HS (1976 grad ) and later after graduation. At about age 21, we had a falling out over whether to move into a really scummy part of town into an apartment together or not. It just wasn't right for me, I was going to Comm. College, and working part time at K-Mart. Anyway, we fought, and never spoke to or saw each other again. About 6 years later I moved to another state.
Fast forward to August 2003. I am playing around on the Classmates website-I don't belong to it, but you can pull up a few things without being a member. I pull up my friend's name just for kicks, and see that she has a married name now. So I go to the white pages for Michigan to see what I can see. (She has an unusual first name, which is ethnic, and she started using it AFTER we "split up".) I FOUND HER!!! She was living in a different city, but I was sure it was her. I sent a note to the address asking if it was her-it was!! The good feeling that we still had was just overwhelming, we have been emailing each other on a regular basis (but for some strange reason, haven't called...?) Found out that she got married 1 WEEK after I did, and a lot of other weird parallels.
If you ever have the chance to reconnect, DO IT. Forget about past disagreements, and just DO IT..