Google is now showing text that says "Ads related to" (and then whatever the search query was) when it displays AdWords ads at the top of search results pages.
For example, here, you see "Ads related to shoes":
This was pointed out by Thomas Ballantyne at Dreams Systems Media on Friday, and confirmed by Search Engine Land as having rolled out (as opposed to being a test) today. Pamela Parker shares a quote from a Google spokesperson, saying, "As part of our ongoing efforts to show ads that are relevant and informative, we are including more information about why users are seeing certain search ads.”
Additionally, Barry Schwartz at Search Engine Roundtable reports that Google has removed arrows to scroll through AdSense ads, which were introduced in 2008.
Last week, Google introduced some refinements to AdSense reporting, including the ability to view all-time reports, access reports from the My Ads tab and download CSVs in the correct local formatting.