Programming question

[Thom Holland]

Hi all,

I want to start programming for my Mac, but I don't know where to 
start.  Specifically, I want to write something that will track my 
automobile expenses and also to sync between my Mac and my PDA.  Right 
now I am using a Handspring Visor running Palm OS, but I am thinking of 
switching to a Sony Clie.

Does anyone have any suggestions on good books to learn script for the 
Mac?  I like the O'Rielly books and I have done some simple scripting in 
UNIX.

TIA,

Thom