Analysis and sympathy have no value if they do not result in any action. There are enough action ideas below that every single person on this list has the power to do at least one, ideally many more..

1. Monitor and contact local media to inform others and counter misinformation. Write letters to the editor (usually 100-150 words) or op-eds (usually 600-800 words) for local newspapers. Also contact radio talk shows and television news departments, especially in response to biased coverage. You can find all local media at: Congress.org - Media Guide
The US Campaign to End the Occupation compiled a fact sheet about US direct contributions to the war on Gaza, which you can use for facts: Israel Is Killing Palestinians in Gaza w/ U.S. Weapons

2. Organize and join demonstrations in front of Israeli embassies or (if that's not doable) in front of the offices of elected officials or other visible place. Inform the media beforehand. Here is a list of the many demonstrations happening around the country (For example, St. Louis, where I live, usually has one a month, but this month there are demonstrations every day): Calendar of Protests--End Israel's Attacks on Gaza

3. Join local activist groups organizing local actions. If there aren't any, start your own. Now is an excellent time to rally support.

4. Initiate boycotts, divestments and sanctions to nonviolently pressure Israeli compliance with international law, as was effective in the struggle against Apartheid in South Africa. Now is an excellent time to rally support and begin a campaign. More info and resources at Global BDS Movement

5. Send direct aid to Gaza through one of the following organizations:
- United Nations Relief and Works Agency
- United Palestinian Appeal
- Islamic Relief
- Canadian Red Cross
- American Near East Refugee Aid (ANERA)
- Physicians for Human Rights
- Other groups: Gaza Humanitarian and Human Rights Organizations
You can also support solidarity activists on the ground at International Solidarity Movement (ISM)

6. Contact elected and other political leaders in your country to urge them to apply pressure to end the attacks. Find your representatives and their contact info at Congress.org - Elected Officials

Call the Obama/Biden Transition Office at 202-540-3000, press 2 to speak to staff member. Tell them the U.S. needs a new Middle East policy, which holds Israel accountable to international law and UN resolutions and human rights. Tell them the U.S. should not support Israel with billions of dollars every year and should not be arming Israel with U.S. made weapons. Add your own suggestions. The time is right for President-elect Obama to hear from the peace community.

7. Sign petitions for Gaza, for example:
GAZA: STOP THE BLOODSHED
Call for Gaza bombings to stop
Stop the Massacre of Palestinians!

8. Put a Palestinian flag at your window. Wear a Palestinian head scarf (keffiya). Wear black arm bands (this helps start conversations with people).

9. Do a group fast for peace one day and hold it in a public place.

10. Inform others in your community with flyers, vigils, and conversations. At the very least, forward this on.

This list was based on a call from the Palestinian Center for Rapprochement Between People and Friends of Sabeel