Take a look at the WEadapt site which has a function which allows you to put observations in a layer on GoogleEarth.
weADAPT is a network of organisations collaborating on adaptation. They have a number of tools, including the Climate Change Explorer, Adaptation Decision Explorer and the Adaptation Layer in Google Earth. Downscaled climate data is available through the University of Cape Town, and there are also introductions to methods that we find useful in our work, such as agent-based modelling. The tools, data and the network could be useful for collaborative mapping.
