If you subscribe to a lot of RSS feeds, you may find yourself wanting to view only a subset of the content. You can organize by folder, but sometimes searching the feeds is the quickest way to get at what you seek. A new service from Q-Sensei is now bringing that Feed search power to your applications via its Q-Sensei FeedBooster API.
The FeedBooster application gives you a basic feed reader, displaying stories in the boxy Portal style made popular by NetVibes and PageFlakes in the Web 2.0 heyday. There is a somewhat buggy Google Reader import support, but have a look at its API Documentation and you realize that's not so important: you can add, remove and update subscriptions right from the API.
It's the search where Q-Sensei is focusing its efforts. The API lets you query your feeds by a bunch of meta-data fields, including author, feed and date. Some of those fields, such as tags, are actually auto-generated by Q-Sensei's "multi-dimensional search" and can be filtered alongside fulltext search.