If you are at all interested in building a maze chase game in the Pac-man genre, or are just interested in the technical details about the game or how to play it, check out the incredibly detailed Pac-man Dossier by Jamey Pittman.
When I was writing the No Tanks! chapter of The Essential Guide Flash Games, I really could have used this information. I looked all over the web for some technial details on Pac-man and found nothing that described the chase logic in any detail. I had to repeatedly play the game and literally guess as to how the logic was set up. I was close, but after reading this, I feel like I have enough information to build an exact clone. Let's see if I find the needed time though.
(8bitjeff is Jeff D. Fulton)