10 most commonly used Shortcuts in Google Reader
Here is the list of 10 most commonly used Shortcuts in Google Reader to improve your efficiency while reading dozens of stuff a day.   Since the official blog of Google Reader does not show the 10 most commonly used commands or shortcuts of this very popular feed reader. I thought I'll expose them for you.  Here we go: - j - Down to the next item.
 - n - In list mode, go to the next item without opening it.
 - k - Up to the previous item.
 - m - Mark Read / Unread.
 - t - Tag an item.
 - p - In list mode, enters the previous item without opening it.
 - shift+n - Skip to the next subscription.
 - v - Visiting the original article.
 - o - To expand / collapse element in list mode.
 - s - Add star (highlight). 
 
Hope you find this easy and useful to use.