Find the Easter Eggs in Google AdWords

Andrew Goodman says there is an Easter egg feature in the new AdWords system:

And did we mention pay-per-call, separate content bidding, an obscure nameless easter egg feature that I don't wish to comment on but would like to thank Google for adding apparently in response to a wish list entry I think I posted long ago at Webmasterworld and SE Watch Forums...

Anyone know what egg Andrew is talking about? A bit hard to search WebmasterWorld right now, but SEW has What are your Top 5 AdWords feature or tool requests?

Based on a bit of thinking and Andrew's posts in that top 5 features thread I think some of the cool things you can now do with AdWords are:

• Run site targeted content ads without paying CPM rates by bidding on the official site names or common phrase matched page elements of sites you want to advertise on.

• Target ads against competing products without competitors being able to prove you are using their trademarks or product names to trigger your ads. This prevents you from taking needless large sums of crap that I took about a year or so ago.
• In the past Andrew also hinted at - trailer park geotargeting and Googleplex-cam.