Just thought about the way people can join a community site build in plone (and maybe other systems).
Right now you might want to comment on something or post to a board. If you are not a member yet you will then first have to go to the registration form and then back to where you want to comment/post.
It would be nicer if the registration form would be already on the comment/posting form and all this would be one action instead of two. Would be more usable and would directly create more registered users as people will not be scared away.
Also on the page should be just the login form for the case that you’re just not logged in.