Grammar Geeks - Behold What we are Liberated From!  

Language Log delves into the prohibition against clause-ending prepositions.  Turns out, it may have sprung from a big old "My prose style is better than yours, nyyahhh," from John Dryden.  

Dryden's prohibition against clause-ending prepositions and his basic argument (which was that his age's conversational and prose styles had evolved, making his prose naturally better*) were both nonsense.  Unfortunately, rather than chucking out the whole thing, a perniciously pointy-headed portion of the populace proposed to pursue the prohibition.  Thus we get phrases like, "This is the sort of English up with which I will not put," which is sort of funny in context, but hideous in everyday application.

*B/C IF THES SI WUT PROS3 HAS AVOLV3D 2 IL TAEK DAVOLUTION THX!!1111! WTF