Just a thought:

I am sure the idea of real-time search using RSS feeds is very appealing to many. To develop a real-time search using publicly available content, one should start where the highest level of fresh content exists and that is the pool of millions of RSS feeds. Using the FeedRank adaptive crawling algorithm we set a new record in fresh content to unit of crawling ratio, making the real-time search a closer reality while setting a new standard as a green web crawling technology.