Jon's Commands provides added functionality in the form of about 30 commands which can be called from AppleScript. To examine the AppleScript syntax of each of the commands, simply drag the Jon's Commands file onto the Script Editor (or one of the commercial script editors), or use the Open Dictionary command to open Jon's Commands. To install Jon's Commands, simply drop it into the Scripting Additions folder inside your Extensions folder which is in your System Folder.
This review was originally posted on VersionTracker.com.<br />I try to stay plain-vanilla in my AppleScripts, but Jon's Commands are great when you just have to do something that Apple didn't bother to put into Applescript. I like using the command-line for some of these, but Jon's Commands make it much simpler for people to really get a lot of power easily when writing AppleScripts. Go Jon!