Yahoo Pipes

A powerful composition tool to aggregate, manipulate, and mashup content from around the web.

One of the  most usefulness of this tool was realized when I could aggregate all the photo together taken by different friends in different cameras and uploaded separately in their Picasa or flicker web albums

I just took the RSS feed of different sources and used a simple UNION operator using yahoo pipes and Bingo ! All the pictures of the event are now together and can be distributed as a single stream.