A 12-minute NASA video with scientist interviews gives an overview of the Alpha Magnetic Spectrometer (AMS) project:

The AMS YouTube channel has videos on the AMS and its hunt for antimatter and dark matter:

For more on antimatter:
Antimatter of Fact: Collider Generates Most Massive Antinucleus Yet
Fermilab Finds New Mechanism for Matter's Dominance over Antimatter
Why Did Matter Beat Out Antimatter?

For more on dark matter:
Reliance on Indirect Evidence Fuels Dark Matter Doubts
New Subatomic Particle Could Help Explain the Mystery of Dark Matter
Dark Matter Researchers Still in the Dark as Underground Search Returns Uncertain Results

Mark Kelly, the husband of wounded Congresswoman Gabrielle Giffords of Arizona, will command the STS-134 space shuttle mission to deliver the AMS to the International Space Station:
Rep. Giffords's husband, astronaut Mark Kelly, plans to command April space shuttle flight

NASA is running a contest to select two new wake-up songs for the shuttle crew during the STS-134 mission:
Space rock: Vote for the new NASA wake-up song