It is not like Haiti where you have this flood of NGOs for various reasons: security, lack of funds, proximity. It's not easy to get to that region. Also, Syria is very controlled inside.
The Syrian Red Crescent—being almost the only relief organization that is functional and that has retained its integrity as other government institutions fragment in the country—has become the coordinating mechanism for pretty much everything that is happening all over Syria.
Within Syria it is not a huge problem. The border areas with Turkey can be, because that is a porous border and many groups, both humanitarian and non-humanitarian, are filtering through. In Jordan, there are coordination mechanisms within and outside the government, and maybe Jessie can speak a bit more on that. In Lebanon, there are coordination mechanisms through the Lebanese Red Cross and with other larger agencies as well that meet regularly to take care of the issues, the needs, and the gaps.