While working on my current project at Yahoo! I had the need to aggregate different search feeds, the requirement was to have a way to pass a param to the url like search=search_term, and this would be passed along to the the feeds and it would return results from all the feeds (obviously it had to be done in the front end only), I thought about adding more requests to my app but I didn’t want to change the code since we were planning on having a re-factor of this part of the code, so super to the rescue, it was a really easy task and got more than I asked for, like filters and sorting… the example speaks for itself: you can clone it and play with it.
You can also check all the other cool examples created by Paul Donnelly or even check Pipes Blog for their latest updates.