Hey buddy, I have Windows too....I wondering the same thing too.
Here's a question for you...did you have the 3G or 3GS iPhone?? I had the 3GS and when I try to sync my videos I took with it to my new iPhone 4 they are all blurry thumbnails....the videos play fine, only the thumbnails within the sync'd camera roll are blurry.
Are you having the same issue? Or have you heard about this?
Thanks