Feedmil is a topic-focused feed search engine that includes news, blogs, microblogs, audio and video casts, and discussion forums in its search to bring new and different material to your daily RSS diet.
Feedmil bills itself as a "long tail" feed search engine, a reference to the frequency distribution curve leveraged by internet titans like Amazon. Sites like Amazon have found great success in selling and distributing less popular but desired items (the long, narrow tail of the popularity distribution curve) Feedmil gives you the option to tweak your searches with sliders, essentially allowing you to investigate the tail of whatever topic you're researching. The result is a trove of neat but not necessarily popular content that FeedMil helps you uncover with some effective drilling down.
Your search results can be further filtered by feed type, rank, relevance, and language. Each entry in the search results is given a rank for popularlity, authority on a topic, activity, and a frequency of posting to give you an idea of how prolific the particular feed is. And while the focus here is on bolstering your feed reading, each result also links to the straight-up web page for casual browsing and bookmarking.
If you're looking for a novel way to discover new reading material, Feedmil is a great tool for finding focused and interesting feeds. If you have your own tool or trick for filtering out the fluff and finding great sources, sound off in the comments below.