One thing that is definately missing in all Civs is a display of how effective a particular wonder is. For example, if a particular wonder brings in more money to me - I'd like to know exactly how much. If that wonder is to become absolete, I'd like to know how much revenue I'd loose. Same with different resource-allocation concepts, like Franchise in CTP2 for example.
You can easily calculate the results for most of these effects if you REALLY want to know, though I admit the calculation could be tedious especially if you had many cities...