GILC -- Web-based remailer
RiotEU -- Web-based remailer
TechnicalFAQ -- A more technical description of remailers
Google -- List of many anonymous-email solutions
MixMaster -- True anonymous email, through many encrypted hops
CypherPunkList -- Listing of people offering Cypherpunk (simple anonymous email forwarding) relays
RemailerFAQ -- Frequently asked questions about remailers
HushMail -- Secure web-based email account