Firstly, in version 3 (the next one) there will be an explicit log-out button, in hind-sight the authentication mechanism that we use to deal with logging in was a mistake and has caused us no end of problems.
Now, if you're using Netscape you can log out just by closing the browser. Next time you open it you will be asked to log in again. If this doesn't happen for you then drop us a note with the Netscape version you are using.
If you're using Internet Explorer (including AOL users) then you need to 'fix' your browser as the default settings are, imho, crud!
Go to Tools/Internet Options and select Security.
Click Custom Level, scroll the list displayed down until you see User Authentication. Select 'Prompt for Username and Password' (why oh why is this not the default sigh) and click OK a couple of times to get out of those menus.
Now you can just close your IE down (you dont have to disconnect from the Internet or reboot your PC) to log out of the site.
As I say though, a proper Logout button will appear in version 3, indeed it's already in all of our other sites.
Let me know if you have any problems with these instructions!
Matt.