You know how easy it is to interact with websites through email. For instance, you can upload photos to Flickr, publish blogs on Tumblr, add tasks to your To Do list in Remember The Milk, upload files to Google Docs, save notes in Evernote, send videos to YouTube, convert documents .. and so much more with a simple email message.
Each of these services provide you with a secret (and often impossible to remember) email address that you are not supposed to share because anything sent to that address will instantly get published / uploaded on to your account.
Since it is fairly hard for anyone to remember these addresses, the alias feature of Gmail can come quite handy here. Lets see how using Flickr as an example.
Now any picture attachment that is addressed to firstname.lastname@example.org will get published on Flickr. You can create similar aliases for other services like email@example.com for YouTube, firstname.lastname@example.org for Google Docs, and so on.
So your single Gmail account acts as a central hub and redirects messages to the relevant service based on the alias used in the address. And since these email aliases are so logical, you will probably have no trouble remembering them even if your email address book isn’t around.
Also see: Create Email Polls using Gmail