Unable to sign up to become an editor

Can anyone tell me why it is that every time I try to submit the "become an editor" form, I get a 404 error, page not found?

Some people using certain combinations of Internet Explorer, ISP, security settings, and so on (exact combinations not yet fully worked out) have been experiencing the odd problem or two submitting some of the various forms recently. If you are using IE, can you try again using Netscape or Mozilla and see if it makes any difference, and post the results back in this thread?