Thoroughly enjoying Google Reader to manage my RSS feeds. Fast and easy to organize, I’ve tried many and found this the best.
Let’s get into the keyboard shortcuts:

j/k - selects the next/previous item in the list
space/shift-space - moves the page down/up
n/p - in list view, selects the next item without opening it
o - in list [...]

Written for Lifehack.org
I discovered Google Reader’s Trends section which monitors what feeds you read and don’t read. It also checks which feeds don’t update, and so, let’s you know which aren’t worth staying subscribed to.
“Check the Inactive tab to see what feeds you may have subscribed to in the past that are no longer being [...]