A taxi driver can answer all sorts of questions, from the best shortcuts around the city, to what a young Jodie Foster would look like as a hooker (hint: pretty good). They can also tell you where to eat, as noted at Chicago Cab Fare.
From a Chicago cat inspired by your average 3a convo with an Ethiopian cabbie about the city's best kitfo, CCF chronicles the recommendations he's received from drivers when inquiring as to the local restos that best represent the cuisine of their home country (fortunately the dearth of Aussie cabbies doesn't matter. You know that ish is Outback). The constantly updated list of recs he's received is broken down by region and subdivided by country, with Indian, Pakistani, and Nigerian options registering most frequently, but Somalian, Iraqi, and Afghani popping up as well, a good thing, as they all know a thing or two about IEDs (It's Excellent & Delicious!). Locations that particularly pique his interest received a visit and an in-depth write-up, from the Ghanaian at Grace African Restaurant, to Romanian at Little Bucharest Bistro, to Indian/Pakistani at Usmania, which he finally hit up after hearing it mentioned by "no fewer than 12 drivers", which goes a long way towards explaining Donald's longevity in spite of constantly going over the middle.
For the more visually inclined, there's a GMap that sports every regional recommendation and's color-coded, which hopefully isn't a shortcut any taxi drivers still use to answer the question of who they should pick up.