When receiving and invitation only the name is given, I would like to see the email address also, to better verify the user.....Further more i would like to see their profile before adding.
Saves time on unknown adders. I hate a populated list of contacts i dont know(already happening). Main reason i dont use chat channels anymore. So im giving ovi the chance here.

Say i accept someone, later to learn we dont know each other,we delete (i would like more information on this process). Is it like MSN we delete a contact but still visible on their end? Is there a block mechanism?

I suggest a delete mechanism that notifies the contact on the other end that he/she is removed and no longer visible. If for any reason prefers or has reason to continue discussion an option to renew invitation is provided.