I was in my Gmail account and noticed a new addition to the Sponsored Links that appear along side the email: the option to get more sponsored links.
Clicking any of the links under “More about…” gets you a page of sponsored links about that topic.
The emails that triggered the above SL were an email on a bonus miles promotion from US Airways and a Dilbert comic strip.
I’ve never found the SL in Gmail to be particularly relevant. It’s interesting to see that they get the general concepts of the emails right. This points to a dearth of quality ad inventory in the topics that people email me about.