Zeus, the man who is known to follow the Google Image Search index and report back on any changes, is updating us on the state of that index. In a WebmasterWorld thread, Zeus said there is a new update that just took place. He said he is happy overall with the changes, because he noticed more images added to the results when the searchsearch filter is set to on. He said this update took place on April 28, 2010.
He said:
He also added an example of what he saw on one of his sites:
The last reported shift in Google Images before this was on February 16th.
Forum discussion at WebmasterWorld.