Gathering and distributing search results as RSS
I often receive questions from people about how search engines gather and distribute subscribed search results such as the results provided by Technorati, Feedster, Blogpulse, PubSub, and MSN or Yahoo! Search. It's worth a brief explanation. Caveat lector, I work for Technorati but I will try to deliver an impartial view of the world of ping and search while keeping the post relatively brief. All of the aforementioned sites output search results in the RSS 2.0 feed format. Your feed results will differ between services based on what is indexed, how frequently it is indexed, and what content is made...
