Sports Night also has a St. Crispin's Day reference, though it's not crucial to the episode. (Just to a really slashy reading.)

Due South also had a whole speech.

They have called this day The Eleventh of March! And whom-so-ever of you gets through this day, unless you are shot in the head or somehow slain… you will stand at tiptoe… when e'er you hear the name again, and you will get excited!…At the name March The Eleventh! We happy few, we few, we band of brothers…our names will be as like…household names. And those who are not here, be they sleeping or… doing something else… They will feel themselves…sort of crappy. Because they are not here to…to join the fight. On this day, the Eleventh of March!!

In "The Adventure of the Global Traveler" the third murderer in Macbeth is revealed to be... Moriarty.

Isn't Sons of Anarchy basically Hamlet on motorcycles?

I'm shocked no one has mentioned Rave Macbeth.

Which is like Macbeth. Kind of sort of not really. Only set in Rave Culture. And starring Lex Luthor and Meg Masters!

Any other songs which do more than just allude to a line but rather examine a character or scene?

Indigo Girls' "Romeo and Juliet."

As an alusion, not necessarily a theme, though a point might be made for Caliban, The CBS series Beauty and the Beast had Vincent rather famously reciting Sonnet XXIX (as well as Rilke, Yeats, Wordsworth, Frost). You might want to go sound only, from about :58 to 2:01. The schmaltz is pretty thick. But I love Perlman's delivery.

The short story "The Macbeth Murder Mystery" by James Thurber.

It's interesting the that tragedies seem to pull the most reinterpretations. Except for Midsummer Night's Dream the comedies are a bit under-exploited.

I think Taming of the Shrew has been reinterpreted quite a bit.

I think Taming of the Shrew has been reinterpreted quite a bit.

Plus, there's the amaaaaaaazing A.C.T. production from the '70s. Starring Marc Singer, and done in commedia dell'arte style. [link]