Whitelists for email going to hotmail/msn/yahoo?

[crayola () optonline net]

Folks, 

My company is currently exploring getting on AOL's 
email spam whitelist since we do send a large amount of 
email, but it is all requested by the people that get it 
(confirmation of bill payments/financial transactions).

Are you aware of any of websites (like AOL's postmaster site) or 
whitelists for Hotmail/MSN, Yahoo, and other large email providers? 

Thanks, 
Mike