Anything you can manage.
This is where I get pushy. Reminding those who are as busy as me or busier, there was a massively destructive earthquake in Pakistan near the India border. The relief efforts need your help. If you don't already have a preferred charity, I recommend this one:
Relief International. It's committed to filling the gaps that other organizations can't get to. It's the Roomba FloorVac of disaster relief outfits. If you haven't given to Hurricane Katrina relief yet, you can do that at this site too. Please.