Trendulo is a sample application to show how Apache Accumulo can be used to perform trending analytics. Currently, Trendulo is split into two projects, one for data ingest, and the other a web app for querying Accumulo. Trendulo supports ingesting Twitter status messages via the Twitter Streaming API.
I have rushed to get a working version of Trendulo to demo at the Boulder/Denver BigData Meetup so there is ample room to improve the quality of code and documentation.