<< I really liked Age of Empires 2 a lot, is this similar, I believe a different company made this one. I played the demo and thought it was fun but not as good as AoE2, the fighting was a lot more difficult to control I thought, but I am interested in it becuase it has so many ages and units. >>
Empire Earth was developed by the same person that did the original AOE. It is very similary to AOE and AOE2, just with 14 ages instead of just 4. I thorougly enjoy playing the game, though the unit AI is severly lacking (you really have to micromanage villagers building walls, or it is 100% certain they will wall themselves in and you end up having to destroy them).
Also, I've never noticed the AI cheating in this game at all, though, like in most RTS games, when switching to higher difficulty levels, it's not the AI that gets tougher, the computer simply gets bonuses (such as faster resource gathering, faster unit production, lower production costs).
I like the unlimited resource model as well. It is still important to expand and get more resource patches because there is a limit to how fast you can gather from any 1 resource patch. They need to make it unlimited so that you can have more prolonged battles, and things don't degenerate in the end to having to rely on 1 last marine being able to take out the enemy because you are out of resources, as often would happen in StarCraft if you let the game go too long.