Is there an easy way (say, a bookmarklet) that, whenever I see a feed, I can subscribe to it so that updates will go into my Gmail?
You could use the official Google reader bookmarklet;
Share anything with a bookmarklet
And add the Reader Gadget to your Gmail sidebar.
Hope this helps.
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2Since the answer was written, Google Reader was discontinued on 1st July 2013. See google.com/reader/about and googleblog.blogspot.co.uk/2013/03/… – chrisbunney Jan 24 '17 at 10:12
Feedpostal.com lets you enter a RSS feed and will then send you daily, weekly or monthly updated depending on your settings.
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You could use http://blogtrottr.com/ - just paste the RSS url and Your email address and click the confirmation.
I just added Chrome extension RSS Feed Reader 5.3.9. Easy to add. Working great so far.
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