The attack of the flotilla carrying humanitarian aid to Gaza has brought attention to the crisis there. Some useful links:
Avaaz has set up a page for people to sign a petition to the UN calling for an international investigation into the attack on the freedom flotilla, and an end to the blockade of Gaza. They are closing in on their goal of 500,000 signers from around the world.
Anera is an aid organization that has been delivering aid to people in Gaza and continues to do so in the wake of this new crisis.
I also really like this HuffPost article that my colleague Annah brought to my attention: http://www.huffingtonpost.com/robert-koehler/davids-slingshot_b_599767.html