I've started a wiki and forum devoted to controls. It's still immature but getting there. The main benefit to my forum is spam filtering. My site doesn't have any spam on it. So far the anti-spam tools are doing their job.
Like I said the forum is new without much on it yet. I've worked my whole career in aerospace so the topics lean in that direction but I'm very open to any controls related topicsthat you might want added. (For example, I don't have a topic on industrial controls or PLC yet. I'm happy to add forum topics for that as soon as anyone shows enough interest to ask.)
Gabe Spradlin