ifttt (shorthand for "if this then that") is a new service that simplifies and consolidates the way online tools can be connected.
"By providing a simple logical structure, if this then that, along with two fundamental properties that fit into that structure, called triggers and actions, ifttt enables anyone to be creative in their digital environments"
I have been playing around with the beta today (currently invite only) and really enjoy the simple way it works. So far I have set up 1 task, when I upload an image to tumblr a tweet is automatically sent to my twitter. This is merely scratching the surface of what is possible, you can see further examples on the ifthisthenthat ideas tumblr. With services such as facebook, twitter, flickr, rss etc there are many possible connections to be made.
It's early days, but ifttt has great potential.