Actually I've just realised that the link is to a whole site dedicated to this subject not just a press release about the book.

It makes interesting reading!

I have'nt read the book, but do have in my possession Brian John's earlier book on Pembrokeshire (1976) in which a page and a quarter gives the Stonehenge glaciation theory, and I don't believe he's changed his very 'fixed' notion from then! Try reading Castleden's 'The Making of Stonehenge' for a measured overview of the theories...
Wainwright and Darvill argue the stones are transported, and I'm with them. One of the first things that hit you about the landscape round the Preseli mountains is the striking outcrop of Carn Meyn, also Foel Drygarn with its beautifully fissured vertical stones - almost made for standing stones...
Subjectively if you were to sit by one of those naturally shaped carns/longbarrows that dot the landscape round Carn Meyn you would understand 'why' prehistoric people could even contemplate the moving of such stones, Stonehenge is one sacred landscape, but this Welsh site is definitely another. The mechanical act of moving stones is the one most argued theory on this board but from a purely female view, its all down hill from the mountain till you reach that marvellous wetland estuary of the Cleddau rivers and Blacklands Mill(which is often mentioned as the place they took the stones from) from thence you float the stones round up to that other great estuary - the Severn....

seems to be a lot of people here that Know the stones were not moved by glaciation without having read the book.
PeteG

i thought Merlin moved them, or was that the bigger stones?

no one is ever going to know really, theres some stones there, and they look good, and to be honest it cant be proved either way how they got there.

at this point im going to point out that they obviously got there by camel.

Coming to this as a complete outsider, so please shoot me down in flames, but why can't oxen have been used? They were domesticated in Europe around 4000bc ?

Tim Darvill will be talking about the bluestones in Oxford on Saturday, 23 January 2010. The talk, entitled Merlin’s magic Stones: Stonehenge and the bluestones, forms part of a one day course on Stonehenge. Other speakers include Amanda Chadburn, Mike Parker Pearson and Julian Thomas.

More here - http://www.conted.ox.ac.uk/courses/details.php?id=O09P146AHJ (and thanks to Gerald Ponting on the Stones Mailing List for flagging this up).