Not sure if this is down to iOS 5 or not...
Before I installed 5 GM, clicking "View full size" when viewing an image from the Google Image search results in Safari would result in a tiny image in the top-left corner that had to be manually pinched out to see at a decent size.
After installing iOS 5, the image is initially displayed filling the screen.
That's one big annoyance for me that's now been fixed.
Again, not sure if it's iOS 5 or whether (coincidentally) Google rolled out a fix on the very same day.
Ian.