Crazy-Idea-Dept: Updating mailing address at one place only!

If you have ever moved then you know the headache associated with changing addresses...I was wondering, maybe some time in the near future, we all will have our addresses in/on some online location...and everyone that needs to mail me can check that address first before slapping a mailing address on the envelope...that way each time I move i would update my address in only one place and all my mail would automatically be delivered to the new address... :)..oh yes, I understand all the security concerns associated with such an idea...