I purchased an Applescript CD from VTC several years back (OS 8.6) I don't know if it has been upgraded for OS X and specifically for features now available in 10.3. The training style/technique is very good. I subscribed to their on-line access and have used a number or programming and Admin modules. VTC is a quality org.
You might look at Matt Neuberg's Applescript book. His explanation of the working of Applescript are as good as Danny Goodman's were initially. With that book in your library and a month's subscription to VTC, you would be $$ ahead and have a very good overview.
HTH
Craig