This is old news to some, but I just discovered another vertical from IAC/Citysearch — Sugarbomber. As opposed to the search orientation of Citysearch itself, these verticals are socially focused and have a browse-centric orientation:
You browse the desserts until you get to the level of an individual restaurant or cafe. At that point, if desired, you can click through the the listing on Citysearch (in this example the name of the business is incorrectly reflected on Sugarbomber):
Although I don’t know how they’re “performing” for Citysearch, I think the strategy is smart and some of these vertical sites make good candidates for mobile apps.