Unicef have a nice programme at the moment involving bicycles. For 25 quid, you can buy a bicycle which will be given to a health worker to enable them to travel further to see more villages. This'll increase access to widwifery, vaccinations and so forth.
From the USA, the cost is $40.
One more bicycle has been sent using this scheme, thanks to Copenhagenize for linking to it (though the danish link is currently inoperative). I arrived at their older post on the unicef scheme via their post on Baisikeli.