I don't really know exactly what I'm doing with Yahoo's Pipes quite yet. But I have managed to fetch some feeds for a project I'm working on with my LINT friends.
Now if I can figure out why Connotea rss feeds just don't seem to work in it, and why I can't see any output in Bloglines, I'll be much happier. No doubt when the promised documentation is available I might be able to figure out what more of the modules actually do.
Michael wrote about Yahoo's Pipes at Impressions Scholarcast.