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The applet at RAMisp.org's page is tailor-made for Google Chrome users who use Google Reader, Pageflakes, Netvibes, or My Yahoo for their RSS reading. Let's assume, though, that a halfway savvy coder could modify RAMisp's page to incorporate other readers (and please post a link if you host it!).
To use the service, head to feeds.ramisp.org in your Chrome browser, then drag the "Auto-Detect RSS" bookmark onto your bookmarks bar (if you don't see a bar, activate it with Control+B). You can also grab a "View RSS Feed" if you want to see a site's feed in your browser.
Head to any page with an RSS feed available, hit your "Auto-Detect RSS" link, and you'll land on a page with the feed displayed and auto-subscription links at the top:

The major downside is the seeming lack of a selector for sites with multiple feeds, as the webapp seemingly grabs the basic index.xml link. Still, that's a rare problem for a handful of sites, and RAMisp's tool offers a nicely minimalist way of shuttling feeds between your browser and your reader, rather than hunting down and copy/pasting XML links. It's free to use.
Feed Viewer for Google Chrome [RAMisp via TechRadar UK]
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