This is a play I came to without any knowledge - I had no clue of this one. I watched the Ralph Fiennes directed film: http://www.rottentomatoes.com/m/coriolanus_2010/ and agreed with the critics - it's great - intense and well acted. I highly recommend it.

Here are some resources I found helpful:

Full Text: http://shakespeare.mit.edu/coriolanus/full.html
The wiki is good: http://en.wikipedia.org/wiki/Coriolanus
http://www.sparknotes.com/shakespeare/coriolanus/summary.html

The theme of power and the different classes runs throughout the play, and I found it very interesting how Coriolanus was unwilling to listen to the people he was invited to rule. Distrust and distain were felt not only by him but with Brutus and Sicinius. One review I read affirmed it was Coriolanus pride and stubbornness were ultimately his doom.

This was also a clear example that you may not want to promote your best employee into a position of power - which we know happens all of the time. Coriolanus was an outstanding warrior on the battlefield but an extremely poor politician.

Favorite quotes:

"He's a very dog to the commonalty."

"What's the matter, you dissentious rogues,
That, rubbing the poor itch of your opinion,
Make yourselves scabs?"

"Nature teaches beasts to know their friends."

"What is the city but the people?"

"Would you have me
False to my nature? Rather say I play
The man I am."

"Like a dull actor now,
I have forgot my part, and I am out,
Even to a full disgrace."