What are cladograms?
Wikipedia is always the best friend for venturing in a totally unknown field. Cladogram.
Here is a page on Phylogenetic trees which I had already looked at while preparing my proposal.
There is this another thing called the phyloXML format. There is a lot of work done on it. There is a sample phyloXML file taken from the same place.
What's a clade? A clade is grouping of an organism and all its descendants.
GeoPhylo Engine is actually something very similar to what I am building. It is different in the sense that it takes a PhyloXML file and not an NeXML file to generate the kml tree.