Count of Items Currently Displayed
It would be quite helpful to have a count column in the lists similar to Excel. Or another way, it could display the count of currently listed items somewhere in the upper right corner. If you were to use a filter it would update to show the new filtered item count.
A few pictures to illustrate the idea.
Excel Example: http://i.imgur.com/2EBXcXI.png
It could be added in the same location like Excel shown by the red arrow :