Members of International community who are very concerned with the Indonesia earthquake where the death toll exceeds 5,000 and many more thousands injured now can visit Merlyna Lim's blog where she is vigorously compiling various international and Indonesia aid relief agencies addresses. 
While Indonesia Help  blog, a newly setup blog by a Yogyakarta blogger whose own home was also destroyed by the quake has a very interesting earthquake news aggregator taken from Yahoo , Newsvine (in English) and Help Jogja (in Bahasa Indonesia) which will serves anyone around the world looking to keep up with the latest info on the natural disaster.
Unspun recommends what kind of relief effort agencies you should contact  in case you are confused about their credibility:
Whenever there is a disaster it is sometimes difficult to know which NGO you can trust to deliver the help. If you're in such a position then consider HOPE worldwide . My office and client, Citigroup Indonesia, have been working with HOPE in several projects, including the Recovery and Rehabilitation effort in Aceh and have found HOPE reliable, efficient and effective. … If you can help, please do.
For Indonesians in Indonesia who would like to follow Unspun's recommendation, you can contact HOPE Indonesia .