my sister told me about this thing that can tell you who has blocked you on msn. it asks for your email and password, i am assuming that it is then not safe? its called block yell.
There are no websites that can tell you if one of your contacts has blocked you or not!
Any that claim they can are purely doing it for malicious reasons, probably to hijack your account so they can spam all your contacts. though at least you had the common sense to realise that it's not safe!