Spinn3r: RSS Content, News Feeds, News Content, News Crawler and Web Crawler APIs
http://spinn3r.com/

Why write your own weblog spider when you can just use ours? Spinn3r is a web service for indexing the blogosphere. They provide raw access to every blog post being published – in real time. They provide the data and you can focus on building your application / mashup. Spinn3r handles all the difficult tasks of running a spider/crawler including spam prevention, language categorization, ping indexing, and trust ranking. This has been added to Bot Research Subject Tracer™ Information Blog.