[kcheung]

You can actually use a secret email address to post on wordpress.

Under -options, writing, you have: Post via e-mail

To post to WordPress by e-mail you must set up a secret e-mail account with POP3 access. Any mail received at this address will be posted, so it’s a good idea to keep this address very secret.

Presumably if the same email was used for multiple blogs, you could get multiple duplicate posts up fairly quickly.

hope that helps.