If anybody's up for it (my own CSS/JS skills aren't much use), you could probably build an online, non-Greasemonkey version of this with an app I've been working on: http://feedvolley.com/

(Basically it lets you take an RSS feed and present it in HTML templates, with whatever Javascript/HTML/etc you want. If you have any questions or need any help feel free to email me at [email protected])