I've added links from each of the plays on the list to their Amazon page, which has a description of the play plus a chance to purchase it, if you haven't read it yet, or want somebody to.
Top three plays clicked so far:
Death of a Salesman
Who's Afraid of Virignia Woolf
Little Foxes
Now, though The Little Foxes is getting a much-praised revival on Broadway, it's out of the top 10 being clicked on this list. However, Six Degrees of Separation -- who is also being revived on Broadway currently (not as good, in my opinion, as Little Foxes) -- IS in the top 10, although just barely.
The top 10 being clicked now are (starting with most clicked)
Who's Afraid of Virginia Woolf
Death of a Salesman
Fences
The Glass Menagerie
Ruined
Doubt
Long Day's Journey Into Night
The Weir
Angels in America
Six Degrees of Separation
Videos