Hotmail Aliases will let you create multiple, “disposable” e-mail accounts that all filter back to your primary email. You can already do this on Yahoo, but you have to pay extra for Plus service. Gmail will let you create unique addresses too, but in that case you can only add an extension to your existing name.
With Hotmail’s solution you can create anything you want. So I guess feel free to flame anyone you want, totally anonymously without giving yourself away. Is that really a good thing? You decide.