I've seen that stackoverflow has one section for advertising jobs. I think it would be very interesting to have a similar thing here for academic open positions.
Please check http://careers.stackoverflow.com
Yes, it would be great if there was a single place where jobs were generally advertised. While I generally widely disseminate jobs in my department, the reach of AC.see is so small, that I would never consider doing it here. Additionally, job adverts do not fit the Q/A nature of our site and a search committee does not want to get involved in a discussion about the position.
If you know about jobs, I say post away in chat. Maybe even make a dedicated chat room if you want.
I am inclined to say they do not belong on the main board, but if we as a community want a single big-list job wiki type question (possibly one per field and year), then I could see if working. That said, I think job wikis are really awful and our format would not improve it. If you want to go that route, ask a new meta question with a detailed description of what you are proposing. Just so you are clear, while as a mod I do what the community wants, I would most likely down vote such a proposal.