Here are some items to supplement your reading and our discussion of Agamemnon.

Didaskalia is one of the best online resources for studying ancient theatre from a contemporary perspective. Go to the study area, especially the Introduction to Greek Stagecraft.

Oresteia entry on Wikipedia. This will put the Agamemnon in the context of the trilogy.

House of Atreus also on Wikipedia. This will give you much of the backstory on the family curse.

Judgment of Paris on Wikipedia. This is another aspect of the backstory on the Trojan War.

The Browning Version is available through Perseus. Read masterVictorian poet Robert Browning's heavily criticized version. 

Oresteia by Xenakis reviewed in the music section of New York Times.You can find excerpts of the recording if you search iTunes and YouTube. Look for the "Kassandra" section for baritone & percussion. Xenakis uses the Aeschylean text.

Introduction to Greek Meter is a very helpful paper by William Annis on the prosody of Ancient Greek. (Link opens to a PDF file)