I donate through Lutheran World Relief not just because I'm Lutheran, but because we provide aid without proselytizing and cost effectively.
http://www.lwr.org/ All of the paperwork details are easy to find on the website, including Senusret I's favorite 990 form and an annual report. They haven't published one for 2009 yet, but in 2008 91.1% of their money was spent on project work, meaning 5.5% for general administration and 3.4% for fundraising.
There was already a presence in Haiti, and they don't just do emergency relief so if you're looking for a group where roughly 91 cents of your donated dollar is getting used for aid without religious restrictions on recipients here's a suggestion.