AppleScript Shell: Command Line AppleScripting
This one is probably going to be of limited interest, but it's still pretty nifty. Daniel Jalkut points us toward the AppleScript Shell by Cameron Hayne. It lets you run AppleScript commands directly from a command line interface for immediate execution. Ash (a la bash) is implemented as a perl script. Daniel's post has a neat application in which he used ash to access some address book information on a remote Mac.
Incidentally, already built into OS X is osascript which allows you to execute a pre-built AppleScript from the command line. If I'm not mistaken, however, I don't think it will allow you to execute AppleScript commands directly. This is worth checking out for the geekier among us.
[Edit: both my colleague Erica and the commentators below have pointed out that it is possible to execute AppleScript commands with osascript, but it does seem that the syntax is a bit cleaner with ash]
[Via red sweater blog]