AppleScript Guides
An introduction to AppleScript, techniques and tips&tricks.

Basic AppleScript information and syntax
what is AppleScript, how it works

Read and write text files with AppleScript
How-to read and write text files with AppleScript, also in case of Unicode

Put a script in Finder contextual menu (Mac OS X 10.4 or earlier)
how to use Automator to execute an AppleScript from Finder contextual menu