I just stumbled on these links for a Glock trigger job. Best one I've seen so far.
Part 1
http://www.m4carbine.net/showthread.php?t=103781
Part 2
http://www.m4carbine.net/showthread.php?t=103933
Part 3
http://www.m4carbine.net/showthread.php?t=103973
Part 4
http://www.m4carbine.net/showthread.php?t=103981