This links to a fund set up by the Richard Dawkins Foundation, collecting money for disaster relief in Haiti. It supports The International Red Cross and Doctors Without Borders, which have no religious affiliation. This is important for two reasons.
First, religious aid is often conditional, used as a means of acquiring converts. Second, donating to this fund will help counteract the myth that charity requires religion and that atheists cannot be compassionate.
If you pay using paypal, the usual paypal fees will not be deducted from your donation because Dawkins is personally paying these (up to $10k).