I generally don't end a sentence with a preposition, unless the sentence sounds awkward. What's your view? http://www.grammartips.homestead.com/prepositions1.html The author here gives some good examples of when the orthodoxy of not ending sentences with prespositions ought to be violated. " Here's another example: There is no need to notify us about problems of which we are already aware. Doesn't it sound far better to say: There is no need to notify us about problems that we are already aware of. I just came across this example in a newspaper article this morning: Officials in Iraq still have not decided with whom he will be allowed to meet. Now see how this version sounds to you: Officials in Iraq still have not decided whom he will be allowed to meet with."