The RPG Stack Exchange site is up and running. Not without a few issues. Some didn't like the fact that other can edit their questions and answers. Like all such things there is a learning curve among the participants and some will take to it and some will prefer the community of a forum.
I asked a couple of questions that I got good answers on. For example I was working on the city of Viridistan and was trying to figure out the immediate geography of the surrouding area.
The resulting answers helped a lot and ultimately led me to several places to look notably medieval London.
So even if you are not going to participate on a regular basis you may want to try asking a question or two for something that you are preparing or wondering about. We need more people that are knowlegable about other game systems to particpate as well. As D&D 4e questions predominate the questions.
The last bit of news is that I been one of the four moderators for the beta. So if you have any specific issue or question let me know.