I don't have much to offer on the subject of SQL or PostgreSQL. But I have been working with standard bodies around the Open Document Format. I work 0n the Calligra Suite (http://www.calligra-suite.org/) and we are actively involved in the development of that document standard.
I must say that this has meant a lot to us both because we have most of our concerns listened to and actually fixed and also because it has meant increased visibility for us. And being involved in the work to bring out a new standard gives you a credibility that is difficult to get in other ways.
I think that more open source projects, especially the larger ones, should get involved in the standard bodies that regulate the area they are active in. This can only bring good to those projects. True, you may have to deal with some politics, but you will have to do that anyway if you don't participate -- but without having any influence at all.