I realize all the buzz is on the next version of Project and Project Server (Version 12) but hey, plenty of us are working on the current version and need to create solutions within the product that is available today.
The free SDK download from Microsoft offers the best resource to beginning your own customizations.
Download it today at:
It would also be very helpful to download the Project 2003 Database Schema
I’m not sure why but I don’t find links to these downloads easily except through Microsoft’s site so I thought I would post them out.