Some of my ideas (I love coming up with game names that will never see the light of day!):-
Take On Trucking (semi business sim/driving sim)
Take On Destruction (rebuild a city, planning how to detonate buildings without damaging ones you need to keep)
Take On Olympics (sorry, I'm British!)
Take On Miner (run a mining company, underground/overground etc)
Take On Emergency (fire fighting tactics/emergency response vehicle; crazy but controlled driving)
:)