I can't log out. I click the link, and it says Cookies Cleared, but if I try to visit the forums again, either through the links provided, or by navigating from the main site, I remain logged in. This in OmniWeb, Shiira, and Safari.
I learned that we can't easily force a logout when the cookie-clearing function doesn't work, but you already found the next-best solution we know - clearing them manually with your web browser's help.
And OmniWeb has the best cookie management of any browser I've used.
I have an even stranger login/logout problem. Let's say I come here, post some stuff, leave (and stay logged in), Reset Safari, come back, and try to post. What happens is one of two things: either I'm still logged in despite the reset, or it looks like I'm logged in but I'm really not logged in (I get a login message when I try to post).