If you fancy getting your hands even more dirty, you could do a lot of this with a few lines of javascript inside an open data table (called, for example, yui.downloads.xml).

Turning the data into a feed does require Pipes, but the tweaking and fetching of all of the streams can be done with a couple of “for each” loops inside a single YQL open data table.

Also :-) you might want to try the new “Create RSS” module we recently added into the operators in Pipes – it makes the transformation to the right RSS fields a lot easier than the loop approach that was needed before.

Jonathan