Google Reader keyboard shortcuts, Part 2 of 4

This 2nd Part in the 4 Part series on Google Reader keyboard shortcuts concerns Action. Basically, how does one act (star, share, view, tag, mark, expand, email) on a given item?

Acting on items
s: star item
+ s: share item
v: view original
t: tag item
m: mark item as read/unread
o/enter: expand/collapse item (list only)
+ a: mark all as read
e: email item