OK, so mods, please feel free to delete this thread if I have violated any terms (I don't think I have, but obviously if I have I do apologise and please feel free to do what you need to with this thread). I have already checked, and I don't think there is a posting about this.
LastPass is a well known online password password manager which is generally well regarded. It has a free offering and a premium subscription offering (which includes things like mobile sync) for US$12 a year.
By referring friends to sign up to the premium service the referrer gets one month free, and the friend also gets one month free.
My referral link is below:
https://lastpass.com/f?4022676