So, I put some more infrastructure behind FeedMagick and lifted a RSS-to-JSON idea from John Resig to transform from MagpieRSS parsing to JSON output.
Here's a spiffy JSON-enriched demo. It was surprisingly easy, all told.
I'm not sure how much time I'll have to really put into this project, but this is the first decent effort I've put into a URL-line suite in a long time. I'm trying to throw in some bits to make it easy to build, document, and use these feed processing commands.