Looking for RSS hacks

I am starting to research RSS hacks on the web for a future series, and I want to note several sources I have found so far:

• Steve Rubel from Micropersuasion has 10 RSS hacks on building RSS feeds for particular authors, feeds for car models, tracking activity on Delicious, following Wikipedia changes, and several other neat tricks.
• Steve Rubel also has several other hack collections for bookmarklets, Technorati, and blogging in general.
• Tim Yang's list of things you can do with RSS has over 40 entries of hacks and tips for getting the most from RSS

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