While I was at SPSP last weekend, Ron Dotsch from Radboud Universiteit Nijmegen stopped by the Millisecond booth and showed me some tutorials he had written on using Inquisit. They are both very well done, easy to understand, and should be helpful to anyone getting started programming Inquisit and analyzing reaction time data.
There are two tutorials:
Inquisit Tutorial - provides a great conceptual overview on how to approach writing Inquisit experiments.
Getting Inquisit Data to SPSS Guide - walks through the process of importing Inquisit data into SPSS and aggregating data from multiple trials into a single row of metrics per subject.