I'm a fairly new visitor to the world of Glorantha (I've just bought a copy of King of Sartar and am reading it alongside the .pdf of The Glorantha Sourcebook) but I'm just as fascinated with the development of the mythology as I am with the mythology itself.
Is there any resource which lists all of the concepts introduced with each Glorantha release? For example, was Argrath introduced in White Bear and Red Moon? Did Arkat exist as a concept before the introduction of Argrath? Is the former a retcon designed to lend more weight to the latter? These are the kind of things I'm interested in.