Here are some recent additions to the small but growing roster of Berry 411 plugins:

Amazon: Search Amazon products
mlb: Show today’s baseball games and scores
rphone: Do a reverse phone lookup from the given phone address to the corresponding name and number

WorkZoo has a produced a map of job distribution over time in the United States, derived from crawling and indexing both major and minor job boards.

WorkZoo provides metasearch and keyword based feeds of jobs. An interesting side benefit of the necessary crawling is the ability to do trend analysis such as this.

Bus Monster is an inspiring example of web services integration.

Bus Monster begins with Google Maps, overlays bus stops by scraping the King County Metro - Trip Planner, adds real-time estimates of bus arrival times using the REST interface to the UW Intelligent Transit Systems, and adds traffic images using a number of Washington state web sites (to convince you to take the bus!)

The work required to glue together services isn’t always pretty, but the results can be stunning.