Eurogamer have put-up a retrospective on the LucasArts classic Zak McKracken and the Alien Mindbenders, with special emphasis on how difficult the game was. Alternatively, read Mixnmojo's own retrospective, written a full two years ago - back when Jim Ward was alive!
Source: Eurogamer
Remember that he worked with Lucasarts a bunch of times, including Mercenaries and Secret Weapons Over Normandie.