Check your 404 error logs for this, I'm sure I'm not alone.
www.webmasterworld.com/google - 404 error page not found
www.webmasterworld.com/google/ - trailing slash is OK and I go to the forum.
My browser is stuck on the unslashed version so I frequently hit the error page.
A simple htaccess tweak could fix this for me and 10000's of other people.