This is a very informative video that covers quite well the different functionalities of MERLOT. I need to emphasize as Cathy indicated during her intervention, the peer reviewing of resources prior to posting them on MERLOT assure quality control.
I feel more confident using resources withing MERLOT, knowing that a community in my field has reviewed them for quality. Please be aware that a resource discovered through Google is not necessarily a good resource in terms of Usability and Quality of Content.