Don't have money but still want to help? I recommend Games That Give, a site that gives advertising dollars to nonprofits when you play games online. Mercy Corps, a relief organization working in Haiti, is a beneficiary on their site.
Haiti is going to need help for a long time. Right now is the time for professional, organized, first-response agencies to go there and get things organized. I spent time in Louisiana the week after Hurricane Katrina and it's important that while our hearts go out to them we understand that there is a time for everything. The next two weeks are search & rescue, water, food and shelter. After that they will need different support, rebuilding and grieving and trying. That's where we can personally step in. Don't forget about Haiti next month or in six months. They will be rebuilding for years.
As yoga followers I think there is something extra we can do. I believe the meditation on goodwill and love for our fellow men cannot be discounted. I also encourage you to look to your higher power tp spread love and compassion at this time.