The Android app is available here (Android) and an iPhone-compatible site is available here (iPhone).

RevMiner is a University of Washington KnowItAll project by Jeff Huang, Oren Etzioni, Luke Zettlemoyer, Kevin Clark, and Christian Lee

The paper is available here (appears in UIST 2012).

Try these examples:

margaritas

good dim sum

agua verde cafe

cheap indian food

mexican

free parking friendly staff fresh fish