A couple of articles here and here. In short, the interest is in semantic tagging based on image analysis. The methods are not explained. An example of image analysis in the second article is very optimistic (”hair”, “smile”, “woman” etc). What separates them from the pack is the test they have conducted with the help of large computer grid in the UK. Millions of images instead of thousands. That’s great. Still, why can’t we see a little online application? The collection does not have to be huge to show the capabilities of a search engine. My impression is, it’ll take a while.