When I log in to a Stack Exchange site, I'm presented with the logo of a few OpenID providers. Since I don't use any of the big 5, I need to click on “More OpenID options…” to be able to type my OpenID.
Please always show the full set of options. The need for an extra click is confusing (uh? you mean I can't log in if I don't have an account at one of these?), and there aren't so many extra options that hiding them could be useful.
N.B. Although this post has been marked status-completed, my request has not been implemented. The gratuitous click is still necessary in a majority of cases — if it's the first time you use a particular browser profile (i.e. every time you log in from a new machine), unless your OpenID is one of the privileged 5, you need to click on “More OpenID options”.