personally, i don't see the big deal with ending sentences with the prepostion as long as the sentence is still clearly understandable. with the exception of 'where you at?' that is...but that's because the at is improper, not for being a prepostion ending a sentence, but because it's redundant.
perhaps it should be noted though, that i don't fault people who choose to use this or other wonky expressions...just the expressions themselves.
Haha, I love the word "wonky"
And as an English major, I get yelled at when I use such language (or should I say "misuse the language") and it just bothers me personally, honestly XD