The Digital Point forums shows a screenshot of what seems to be a new Google AdSense format experiment. At the bottom of the vertical banner ad, which is a leaderboard, with 728x90 pixels, you can see a variety of linked keywords, e.g. “Celebs” and “Hot Celebrity”.
The second Google AdSense test is a "show more" link found at the bottom of Google ads. I found this at iBrowseHere.com, and here is a screen shot of it in action.
Clicking on the "Show More" link takes you to a new page with related ads. In a related now, there was a outage that took down all Google PPA ads over a 24+ hour period this weekend.Google, AdSense, Keywords, Show More, AdSense With Keywords List, AdSense with show more, AdSense Format, AdSense Ad, Ad Format