In reply to MeRK (msg # 1):
I don't know why it's not working for you. It works fine here. The logout link calls a server side script. When you hover your mouse over it, look in your status bar to see that it refers to the link:
/login.cgi?specialaction=logout
If not, you may wish to check your system for some sort of browser hijack or other malware. Are you having issues elsewhere?
Let's start with the basics and work the problem: what operating system, and what browser are you using?