Yeah, sure. Why not. Didn't I set that up?
EDIT: Here's last year's invite. See if it works ...
HEY kechuas!!!! You are invited to join my online football office pool! To accept this invitation and join the pool, click the link below (or cut and paste the link into your browser's address bar). You'll be asked to enter the pool's password before you can join. The pool password is included below.
Password is bmanrocks
http://wiiunite.football.cbssports.com/e?ttag=FFB10_cbsinvOur Pool password is: bmanrocks