It's nicely done. Citysearch has the advantage of having editorial staff to confirm listings whereas Yahoo and Google are just buying / scraping their local data, meaning there's all kinds of errors.
I'm surprised that Ask Jeeves isn't incorporating any more CitySearch content on their local search results page (e.g. user reviews, editorial reviews). I wonder if it's because Citysearch wouldn't give it up, or if it's Ask's preference to keep the page clean.
Also, clicking through on a merchant name takes you to a Citysearch branded page, with only a 'return to ask jeeves' link and an ask search bar to let you know you came from ask jeeves local.
It's interesting that Ask, Google & Yahoo released their local search all about the same time. I guess no one wanted to be left behind. I think Google has the best interface so far - it seems to be the least cluttered and includes sponsored listing. However lorenzinho2 makes a good point about accuracy so maybe Ask wins.
Maybe it's time to study local search. Can someone comment on where to find the talk about each of these.. and how mature those forums are? Looking for how they rank/rate sites, what's important, etc...
Clearly local search is using different criteria across the board.... I suppose the one that works best will make it into the SE eventually (e.g. "chiropractor NY 10001" works OK in google SE, but is quite different in google local).
Also interesting how they each define the "geographic center" of a City (in order to show closest at the top). I don't know many visitors to a city who know what zip code they are in... and the "center" doesn't appear to be too cenral by my quick check.