I've just been sent a link to If This Then That and it looks like it might be very useful.
You have various "channels" for the "this" and "that" actions, one of them being e-mail. So you can set up a recipe that states:
If it's going to rain tomorrow send me an e-mail.
Now I have various e-mail accounts and addresses so what I'd like is to set up multiple e-mail channels.
Is this possible?