To follow up on Mark's discussion of the story of the tower of Bab-El, I had a look at the Book of Mormon, which turns out to mention the story in passing in several places.
Omni 1:22
It also spake a few words concerning his fathers. And his first parents came out from the tower, at the time the Lord confounded the language of the people; and the severity of the Lord fell upon them according to his judgments, which are just; and their bones lay scattered in the land northward.
Mosiah 28:17
Now after Mosiah had finished translating these records, behold, it gave an account of the people who were destroyed, from the time that they were destroyed back to the building of the great tower, at the time the Lord confounded the language of the people and they were scattered abroad upon the face of all the earth, yea, and even from that time back until the creation of Adam.
Perhaps the most interesting part is the bit in the Book of Ether which mentions that the language of certain people was not "confounded", which presumably means that these people were allowed to retain the language that they had hitherto spoken.
Ether 1:33-37
Which Jared came forth with his brother and their families, with some others and their families, from the great tower, at the time the Lord confounded the language of the people, and swore in his wrath that they should be scattered upon all the face of the earth; and according to the word of the Lord the people were scattered.
And the brother of Jared being a large and mighty man, and a man highly favored of the Lord, Jared, his brother, said unto him: Cry unto the Lord, that he will not confound us that we may not understand our words.
And it came to pass that the brother of Jared did cry unto the Lord, and the Lord had compassion upon Jared; therefore he did not confound the language of Jared; and Jared and his brother were not confounded.
Then Jared said unto his brother: Cry again unto the Lord, and it may be that he will turn away his anger from them who are our friends, that he confound not their language.
And it came to pass that the brother of Jared did cry unto the Lord, and the Lord had compassion upon their friends and their families also, that they were not confounded.
There is also a reference to a language having become "corrupted", which presumably describes language change:
Omni 1:17
And at the time that Mosiah discovered them, they had become exceedingly numerous. Nevertheless, they had had many wars and serious contentions, and had fallen by the sword from time to time; and their language had become corrupted; and they had brought no records with them; and they denied the being of their Creator; and Mosiah, nor the people of Mosiah, could understand them.Posted by Bill Poser at December 31, 2007 02:15 PM