It's pretty obvious that outside the resort areas, there is still a lot of poverty in Bali. It's nice to know that in fact you can contribute a bit toward improving the lives of those living in poverty in Bali.
Here's some examples:
http://www.ethicalandgreen.org (supports education in northern Bali)
https://www.facebook.com/TheRooftopAtLesBaliAccommodation (accommodation where 50% of the total spend goes to local education)
http://www.ecolodgesindonesia.com/
http://www.jed.or.id/EN/tips.php - tips for travellers wanting to travel responsibly in Bali
http://www.jed.or.id/EN/welcome.php - VILLAGE ECOTOURISM NETWORK, BALI