I have always had a great appreciation for poetry, not the love poems that people often first think of, but anything which is emotionally powerful, tragic or dark.  I have found a few favorite excerpts or entire pieces and I have them stuck up on the walls of my room at uni.  Here they are online as well...

IIs this a dagger which I see before me? 
[Macbeth]
Riddle of affairs and death.
[Macbeth]
Double, double toil and trouble
[Macbeth]
Macbeth does murder sleep!
[Macbeth]
To-morrow, and to-morrow, and to-morrow.
[Macbeth]
To be, or not to be: that is the question.
[Hamlet]
I talk of dreams.
[Romeo & Juliet]
To smooth that rough touch with a tender kiss.
[Romeo & Juliet]
My only love sprung from my only hate!
[Romeo & Juliet]
But, soft! What light through yonder window breaks?
[Romeo & Juliet]
O Romeo, Romeo! Wherefore art though Romeo?
[Romeo & Juliet]
Thou art a villian.
[Romeo & Juliet]
My dear Lady Disdain! Are you yet living?
[Much Ado About Nothing]
All women shall pardon me.
[Much Ado About Nothing]
Her hair shall be of what colour it please God.
[Much Ado About Nothing]
Hey nonny, nonny.
[Much Ado About Nothing]
I did not think I should live till I were married.
[Much Ado About Nothing]
Disdain and scorn ride sparkling in her eyes.
[Much Ado About Nothing]
Some cupid kills with arrow, some with traps.
[Much Ado About Nothing]

Ode to Melancholy
John Keats
Silence
Thomas Hood
The Raven
Edgar Allan Poe

The Man From Snowy River
A.B. (Banjo) Paterson

[On the way: The Lady of Shallot, 
Suburban Sonnet, In the Park and a few others.]