ApplescriptObjC Learning Materials/Books?

Hey All

I was wondering if anyone could recommend where I can find a good book or some good tutorials on using ApplescriptObjC to build basic apps. I am relatively new to Applescript and Had only recently discovered Applescript Studio but I am aware that studio has been depracated as off 10.6 so I think it makes more sense to start using AppleScriptObjC.

Any help/suggestions welcome

Thanks all