In followup to my prior post on Pictish stones, I see that this guy has written a book on them.

I find stuff like this insanely interesting, and i could spend hours on the web researching. It is a good thing I don't live in Scotland or England, because I'd probably spend all my spare time running around looking at and hunting for the spoor of the Picts, and Scots, and Norse, and the Saxons, and the Romans, ad nauseam. 

I plan on getting a copy when it comes out later this spring.