admittedly a lot of the "tips", I don't feel would work in a swinger environment. But I think with some tweaks some things can definately be applied. A couple of things from the most recent episode...
Look like you are having fun - because people want to hang out with other fun people.
False Time Constraints - this has been brought up in many other threads. When you approach someone make a comment that lets them know you only intend to (or can) stay for a few minutes. This puts them at ease in knowing that you aren't going to latch onto them for the night. Then start moving to leave before you even done talking, like mid-sentance - which puts it in their ballpark to invite you to stay longer or come back.
This last one we applied at one of the last socials we went to. We made an effort to talk to as many people as possible at that social and we only sat down at a table once and that was after they invited us, after we tried to leave once. Needless to say we hit it off when them quite well but before we found them we had a great time meeting many new people. Sometimes finding a table and sitting down early can be what kills your whole night.
Another one that we have often pointed out to single guys but really applies to all of us.... pay respect to the person of the same sex first. If you are a guy approaching a couple, introduce yourself to the guy first ... same if you are a woman. Females if you approach a couple alone speak to the other female first. If you approach as a couple the same thing applies... usually when we approach as a couple one half of the couple does the majority of the talking... that person should first introduce themselves (and their partner) to the same sex person of the other couple. We all know that as couples we each have to be comfortable with the people that our partners may potentially play with, and we can't be comfortable with those people if they try to act like we aren't there.