Google recently updated GMail, and in the process they removed the "Select" line just under the buttons at the top. Unfortunately for most people (myself included), this was something that they used often! After reading the messages that weren’t spam, my natural motion was to select "Unread", then move up a bit and click Delete. I used it many times a day.
But after the update, the selector was hidden in a dropdown under a checkbox on the left. Very inconvenient!
So, Greasemonkey to the rescue again! I wrote this Greasemonkey script: Gmail – Restore "Select" line including "Unread" link
This will add the "Select" line in and bring back one-click access to message selection, like this:
Enjoy 