While the MM IV had some open monsters in it, they were all presented with class levels or templates of some kind. The book contains no Open Content, however, so the only place you can get anything online is whatever previews Wizards itself has put up. To my knowledge the only MM other than the 1st that contained any open content was the 2nd one with the Razor Beast and Scorpionfolk and can be found at d20srd.org.
Edit: I may have misunderstood your question. Are you asking if open monsters are simply presented in the new stat block format anywhere? The answer is no, not to my knowledge. Paizo has its own stat block format and you can find some of the monsters presented in their books in a different format, especially ones with class levels.