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?
Feedpostal.com lets you enter a RSS feed and will then send you daily, weekly or monthly updated depending on your settings.
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.