Today Lifehacker featured a story suggesting that you set up a system of Gmail filters to forward email to hard-to-remember addresses like your Flickr upload address. There’s nothing wrong with the Lifehacker/Digital Inspiration method, except that it’s too complicated.
As long as I can remember, Gmail and most desktop mail clients feature auto-complete features in their address fields so that you can type the name of the contact rather than having to remember their email address.
If you don’t want to get your hands dirty with Gmail filters, just come up with memorable and descriptive names for your email contacts. That way all you have to do is type in “Remember The Milk” and the address should pop up for you. It’s just as effective as the filter method, and much simpler.