some pathfinding related links I found useful and posted earlier:
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=390963#Post390963the 2nd is great as a start.
for a shooter I recommend you to try Wjbender's navmesh pathfinder you can find at 3rd party tools section, and the waypoint based Intense pathfinder you can get by downloading the goodies8.zip from 3dgs downloads page.
