The one thing I find with all of those ideas for developing mmail.info is that it would be difficult for the average user to type it in. If you were to develop a site called moneymail info, I think most people would try to type in moneymail.info, rather than mmail.info.
Also, the ext hurts a lot. Assuming you are talking of an email type system, .info does not go too well. I would not want to be [email protected], it's too confusing for me to tell people that one!
Bearing that in mind, you would need to well develop this one to make it worth more than reg fee, which is what I think it is worth at the moment.