It's likely to become a Famous Speech; it's a carefully-structured piece of rhetoric worth considering in the English classroom (I'm thinking of how Earl Spencer's speech at his sister Diana's funeral was part of an English HSC paper a few years ago). News reports say that Obama wrote it himself.
The above YouTube link from the whitehouse channel:
A transcript of the speech can be found here.
Another one to share with your English teachers.
Added later: I had been talking with our English teachers about this, and one came back to me today (4 May) with this article by Pamela Gerloff of the Huffington Post: The Psychology of Revenge: Why We Should Stop Celebrating Osama Bin Laden's Death. Said it generated excellent discussion in her classroom.
Further information/opinion is from respected human rights lawyer Geoffrey Robertson QC, on the ABC website: Bin Laden's killing 'a perversion of justice'.