I agree that it would be a disaster if non-members were allowed to post.
We all have computing equipment, and I think it would be useful to have a hardware forum. This could combine desktops, notebooks and mobiles, and could always be split if it becomes too busy.
One of the aims of Bitcoin is to provide a payment method for users of the Internet. Many of these users will have, or consider creating, websites. One of my frequent appeals is for a domain owners board, with a buying and selling sub-board. The digital goods sales board here is completely useless for a domain name trader in my opinion. That is based on previous attempts to use it, so maybe I should have another go.