Here’s a link to the Red Cross webpage about giving.
Red Cross Continuing to Push Aid to Haiti Amid Difficult Conditions.
Here’s a link to a blog about other agencies and how to give, if you can. It comes via Change.org.
http://globalhealth.change.org/blog/view/haiti_rocked_by_massive_earthquake

Here’s a link to the Better Business Bureau’s landing page on giving to charities. They have suggestions and recommendations to avoid being scammed. Follow the link to a button specifically to giving in wake of the earthquake in Haiti.
http://www.bbb.org/us/charity/