Yelp for Android determines your current location (either using built-in GPS or a Wi-Fi-based location) and then lets you search for nearby businesses, read reviews of establishments and access a moveable Google map that can help you easily redefine your search based on locale.
Yelp's game plan for its mobile apps: Release an app that's a useful, stable product first, and then add bells and whistles and other updates over time. Yelp says they plan to release more updates to the Android app before the new year, but wanted to make the app available so Yelp users could start taking advantage of the service now.
In addition to location-aware searches, Yelp for Android also lets users filter their search by "Price," "Open Now," "Special Offers" and "Hot on Yelp."