List of organizations that accept donations for Haiti relief:

UNICEF, Direct Relief, Yele Haiti, Partners in Health, Red Cross, World Food Program, Mercy Corps, Save the Children, Lambi Fund, Doctors Without Borders, The International Rescue Committee, Care, William J. Clinton Foundation, Meds & Food For Kids, Clinton Bush Haiti Fund.

You can text donations for Haiti relief from your cell phone: (Note: In addition to your donation amount, standard text messaging fees will apply.)

From US:
Red Cross: Text HAITI to 90999 ($10 donation)
Yéle Haiti: Text YELE to 501501 ($5 donation)
United Way: Text HAITI to 864833 ($5 donation)
Intl Medical Corps: Text HAITI to 85944 ($10 donation)
World Food Program: Text: FRIENDS to 90999 ($5 donation)
UN Foundation: Text CERF to 90999 ($5 donation)
Clinton Foundation: Text HAITI to 20222 ($10 donation)
Compassion Intl: Text DISASTER to 85944 ($10 donation)
Intl Rescue Committee Text: HAITI to 25383 ($5 donation)
The Salvation Army: Text HAITI to 52000 ($10 donation) 

From Canada:
Salvation Army in Canada: Text HAITI to 45678 ($5 donation) 

From the United Kingdom:
Disasters Emergency Committee: Text GIVE to 70077 (£5 Pounds) 

From France:
French Red Cross: Text HAITI to 80222 (1 Euro)  

You can also donate via iTunes: click here.

Watch Presidents Obama, Bush, & Clinton: Help for Haiti:

Watch Clinton Bush Haiti Fund's clip:

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Sources and links:

CNN: http://www.cnn.com/2010/LIVING/01/13/haiti.earthquake.how.to.help/index.html?hpt=T2

Google: http://www.google.com/relief/haitiearthquake/

Yahoo: http://haitiearthquake.yahoo.com/networkforgood/index.html

Microsoft: http://www.microsoft.com/about/corporatecitizenship/en-us/our-actions/in-the-community/disaster-and-humanitarian-response/community-involvement.aspx

NBC: http://www.nbc.com/golden-globes/haiti-relief/