What an utterly delightful thread! Although, being named Bill, the last post rather grated on me ...
As far as the sentence-ending preposition, I'm reminded of an old, politically incorrect joke: A young black (African-American?) [excellent example of when the "big dog" belongs in the cage] man, one of the first of his race to attend the Ivy League, is walking across the campus of Princeton University, hopelessly lost. He spots an upperclassman and asks, "excuse me, can you tell me where the library's at?" [another example]
The haughty upperclassman (white, of course, and very snobby, too) looks down his patrician nose and replies condescedingly, "young man, at Princeton, we do not end
sentences with prepositions."
Whereupon the young black student replied: "Excuse me, sir. Can you tell me where the library is at, *********"