One thing that bothers me is the fact that no where in the Bible is Nimrod mentioned in conjunction with the Tower of Babel's confusion of languages. If you are mentioning the two as if they occured in conjunction, then you are still under the control of the skewed Jehovah's Witness theology. Read the account, tell me there is credible evidence that they even remotely occured at the same time in biblical history.
The book of Genesis is notorious for jumping hundreds, if not thousands of years in a single verse....Nimrod had absolutely nothing to do with the Tower of Babel, cause it aint there.
The Tower of Babel story is proof of several things,
1) The capability of man to achieve whatever his imagination moves him to do.
2) That God is not singular...He is dualistic in his persona. (he expresses his concern with other members of the godhead)
3) God is petty and worried about big building programs, unless they are undertaken by the Watchtower organization.