ToME WikiReenenLaurie: I've moved from PC to PC a lot these days, and I find that logging in (and creating a new username) is not 'obvious' and to have a link to it on the frontpage seems intuitive.
I usually click on userpreferences (which there is a link for) and then log in. This is not that obvious since you're not a 'user' yet when you've not logged in.