Having searched this site I noticed discussions on resource and many have been already suggested by others. Also, someone named "Amra" (of Conan the Barbarian fame) compiled several resource types on another thread. I've decided to add a few of my own for future referrence for game modders as well as for the people at Fireaxis. This was the best thread I could find to post my suggestions. Thanks.
Resources
Titanium: A strategic resource. Used to make advanced modern military units mainly tanks and aircraft and possibly space craft components. +3 hammers. Requires Mine.
Tin: Strategic Resource. Required to make bronze. +3 hammers. Requires Mine.
Plutonium: A strategic resource. Used for fission and fission/fusion based weapons. Possibly as for fusion based weapons. +2 hammers, +4 gold. Requires Mine.
Platinum: A luxury resource. Used to make fin jewlery. May also be a strategic resource. +4 hammers, +7 gold, +1 happy. Requires Mine.
Nickel: A strategic resource. Used in several industrial possesses sinse the late 19th/early 20th centuries. Also required for WWI and WWII era units as well as batteries for electricity. Nickel is also used in steel production. +4 hammers. Requires Mine.
Zinc: Stategic resouce. Needed to make brass with copper. Again used in several industrial processes. Also for music (instraments), coinage, churches (toll bells) and shells for tanks, artillary as well as munitions in general. Also used in some early gunpower units. +3 hammers. Requires Mine.
The following food resources would add some "colour" to the game.
Garlic (good for health): +3 health, +1 food. Requires Farm
Dates, figs, apples, cherries/berries, oranges, pinnaples and coconuts: +1 food, +2 health each. Requires Plantation or Orchard.
Tea: +1 happy face, +2 gold. Requires Tea Plantation.
Game birds (grouse, turkey, duck, pheasent etc...): +2 food, +1 health. Requires Farm.
Bison/buffalo: +2 food, +2 hammers. Requires Ranch.
Camels: A strategic resource for camel based units. +2 hammers, +1 gold. Requires Pasture.
Furthermore, many food/animal/plant based resources should be situated according to climate. Some resources may also be rarer (harder to come by) than others.