Google Changed FeedBurner Url

Today? I checked my RSS Feeds Reader and notice something different, which might be there for a while now. Looks like google changed feedburner urls , before was something like http://feeds.feedburner.com/~r/livecrunch/technology/~3/369523747/ well today starts with http://feedproxy.google.com/~r/livecrunch/technology/~3/369523747 and makes quick redirect to the url you want to visit. From many RSS feeds that I am subscribed to, I only saw few blogs having such urls. I wonder why?

Example: TechCrunch Post or TC Post