[Lizard]

Probably the easiest way to get started is to take a look at the OmniPlan AppleScript dictionary itself, either in Script Editor, ScriptDebugger, or some other AppleScript development app. We've integrated basic documentation right in there, rather than writing a whole separate document. If you launch Script Editor (in /Applications/AppleScript by default), it should show you a library window. If OmniPlan is on the list, just double-click it. Otherwise, click the '+' and browse to wherever you keep OmniPlan on your computer.

That'll give you a complete list of the currently available classes, their properties, etc., etc.