Would someone who has installed this mind linking their site (or, rather, a page that would generate a 404 error), so I could see it in action (preferrably in English)?

I think this is incorrect for anyone who has their forum in a directory (forums)

ErrorDocument 404 /404.php

should it not be ErrorDocument 404 /forums/404.php

or substitute forums for the correct directory name.

Does it still work with vB 4.x?

Don't work for me, I used a link that google Webmaster doesn't like to test and it still comes up with the vBulletin page that says.

"No Thread specified. If you followed a valid link, please notify the administrator"

Here's a Link to the page:
http://www.united4freedom.net/showthread.php?p=22960

Any suggestions would be appreciated...

Thank you,
Tom

http://www.united4freedom.net/dfhfg4546465

Its working ;)

worked tanx