With just one click on the context menu, you can then ...
- reply to that email without explicitly opening it
- find all emails which have originated from the same email address as that of the selected email
- move all emails from the same sender to a specified folder
- delete all emails which have originated from the same email address at once
This a pretty neat & thoughtful shortcut!
If you right click on that email, it opens up a context menu that will let you perform operations on that email alone
Also see:
Hotmail lets you download attachments as a zip file
The One Click GMail Help Layer UI Pattern