I could not disagree more with the argument on usage included with this entry. I am committed to the belief that a preposition is an introduction to a modifying phrase, not an alternative adjective. The example given, highlighted even better by the ubiquitous "Where are you at?", is sloppy writing or speaking, nothing more, nothing less. As to splitting infinitives. the same accusation applies. An extraneous adverb does not contribute well to the meaning of a sentence. If an adverb is needed, it belongs after a verb.