I once know of a group of people who always go to Wat Don Chan, Chiangmai to cook for the Orphans in the temple and donated money on a regular basis. They no longer doing it and it's kind of disappointing.

Lately when I check out the web for this temple, I'm really happy to know that there are foreign volunteers/organization who offer great help to them. Some examples are

1. Toys for Thailand - http://www.toysforthailand.org/
2. Dreams can come True Foundation - http://www.dcct.org/
3. The Chiangmai Family Services - http://www.familycare.org
   

These organization not only collect donation to improve the facilities ( bed, toilet and shower facility ), they also make sure that there will be sufficient food to feed all the 650 children. They teach the children 4 subjects; art (including painting, handicrafts and jewellery crafting), English, sports (including music and dancing), and photography. They can sell the handicraft and proceed will go to the Temple for future use.

Source - http://www.chiangmai-mail.com/294/community.shtml