I'm not sure if this is new or not, I only checked today and there was a major update last week.
From Yahoo's search box type in "things to do in" and add your city name.
Yahoo will return in top spot (I checked a lot of major cities, not all of them). I don't mean just above the #1 ranked site, I mean THE #1 ranked site.
Type in a small city, one out of the way on any map and Yahoo will still return #1. The problem with that is when you look at the #1 yahoo page for smaller cities, often it says "no current listings for this area" and thats all, the rest of the page is the full spectrum of ads including two huge sponsor boxes, the full sponsor sidebar, some sponsors top and bottom and a menu to other yahoo features.
There are far better sites for those small cities but spot #2 is the glass ceiling now? Of course in Google results Yahoo is nowhere near top spot on the same searches.
My concern with this is that it would likely continue, one type of search at a time as the "yahoo answers" crowd continues to create content for Yahoo by asking and answering questions. I think algorithm rules should apply even to yahoo answers or it should be moved to sponsors. To say that a page with "no listings yet" is the number one site is misleading.
Serps would look like...
Up top, paid sponsors galore
#1 - yahoo answers,
#2 - yahoo travel,
#3 - yahoo knowledge,
#4 - site by joe schmoe who is physicaly 40 years older for the effort he put into one site.
#5 - wikipedia....