I am one of those who has been hoping that we would some day get a story telling us what happened to Steven Taylor after he was left behind to rule the planet of the Savages, and Simon Guerrier, who has done well in First Doctor stories for Big Finish, has finally provided us with one - though this is only the framing narrative, as Steven, long since overthrown by his former subjects, tells a visitor of a previous adventure on a planet where the time travellers were conscripted into a long-entrenched war between two factions. There is basically one idea here but it is done awfully well and fills the time very nicely, driven by Peter Purves' performance in his old role (and doing a decent take on the First Doctor and Dodo as well). And there's a fairly mind-blowing twist at the end; this was apparently the very last of the Companion Chronicles to be recorded, so I hope that Big Finish will come back to resolve it in their new range.
His other main point is to propose an alternative to the "family tree" model of language relationships. It works well for Indeo-European (within limits) and also for the Austronesian languages of the Pacific; but he is sceptical, to put it politely, of Greenblatt's claims to have constructed family trees for the African and Amerindian languages, let alone the pretensions of Nostratic. Surely in most cases where different language groups exist side by side for centuries, it makes at least as much sense to consider a "linguistic area" where neighbouring speakers may steal vocabulary and grammar from each other. His example is Australia, the area he knows best, but I can see relevance for the Albanian / Macedonian / Bulgarian / Romanian relationship which I've always found fascinating. He makes the point that even Proto-Indo-European doesn't appear to have been homogenous - did the instrumental plural end with *-bhis or *-mis ?
Anyway, I found this rather more digestible than dear old C.-J. Bailey's essay collection. Must look out for more on this topic..