As of yesterday, actually, Google had indexed “more than 50%” of its PDF index, but let’s assume they’ll eventually pull down all the files it can. You’ll notice the “View as HTML” option is now missing from search results, but never fear, fans of pared-down text—it’s included as an option, next to saving and printing, in the Quick View frame.
Quickly view formatted PDFs in your search results [Official Google Blog]