Some good suggestions here...
I think the commentary on strategic RTS's in general is probably true for all. However, I'm not sure that resource mgmnt and troop mobilization are enough for an educational recommendation. For instance, the detailed economic model in Pacific Storm might have some value... but just harvesting crystals and sending waves of drones into a blender is perhaps a tad too gamey.
I was thinking possibly one of the Total War titles, but I haven't played any of those myself. ...or maybe some of the strategy games of the civil war era.
I'm also looking for stuff that is currently and readily available... a couple of the suggestions are good (Grim Fandango, Oregon Trail, and Myst) although it would probably be difficult to locate those gems at the local Best Buy.
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