Some great information (videos, articles, what have you) on the Gaza/Palestine/Israel situation:
The Real News Network: Who and what is Hamas?
Guardian: UN levels war crimes warning at Israel
The Huffington Post: Understanding the Gaza Catastrophe
VBS.TV: Palestine vs. Israel - Against the Wall (Par 1 of 6) - A look at the situation in the West Bank.
Znet: Israel must lose - An open letter signed by a litany of academics.
Znet: Gaza Q&A
Petitions to sign:
Amnesty International: Civilians must be protected in Gaza and Israel
Campaign for Peace and Democracy: No blank check for Isael!
Be sure to check out the links in the post itself, also.