Very cool. Reminds me of an app I once co-built (with the now famous Mr. Bragger ;) that lets you skin an RSS feed with a customizable HTML/CSS template (compatible with Tumblr's template markup) http://feedvolley.com/ (code: https://github.com/niryariv/FeedVolley ) - could use a little UI love, but pretty stable. If anyone's interested in building this further I'd be happy to help you get started.
Interesting. It can't seem to find a feed on https://grepular.com/ though. Is that because it's https?
It uses magpie RSS lib, but it's probably a pretty old version by now. If it doesn't auto-discover the feed you can just enter the feed URL, it should work.