Dont know if it was mentioned before but i would love to see also maybe some tutorials how the Forum is working , would be informative and specially for new Users maybe helpful.
It sure would. A video for newbies on how to post and take part in discussions and what not to do. Things like multiquoting, quoting the OP, quoting pictures, posting unnecessarily large pictures, etc. I know I would be interested in learning more about tables and table layouts because they can be a real nightmare. I have seen it myself.
You could talk about bbcodes. I would be interested in seeing a video about the feature where you click on a hyperlink and it takes you to that part of the thread where that is discussed. Things like that, which aren't known to everyone.