Postings (formerly CLapp) attempts to be the easiest to use and the most visually appealing Craigslist search application in the Marketplace and is written by a Craigslist addict for Craigslist addicts.

Note: We no longer are able to show listings from the Personals section of Craigslist since the content violates the Play Store's terms of service and we can no longer risk being pulled from the Store (we have been twice now as a result).
From version Postings (Craigslist Search App) 4.1.3:
Returned Year range query in the Car and Truck categories
Added posting support for Garage and Moving Sales
Fixed posting to Tickets categories and a few others
All versions