Instant Mashups: The "mash" Command
The mash command is the inverse of the multi command mentioned earlier. Instead of applying several words to a single command, it applies several commands to a single word. In other words, you can create instant mashups.
So for example, you can mash up Google Images, Yahoo Images, and Flickr: mash porsche gim yim flk
Or see how various dictionaries compare: mash antidisestablishmentarianism dic thes a encarta
Here's a combination of Google Maps and Amazon: mash honolulu gmaps am