Jimmy Maher -- if you haven't heard of him, check out The Digital Antiquarian, his astoundingly comprehensive blog on the history of home computing -- writes up the Amiga for the Platform Studies series.
While I'd quibble with the choice of focus in a few places (a hazard of writing about a much-loved computing platform), this is well-researched, thoroughly interesting stuff, and I'd cheerfully recommend it to anybody.
ISBN 0262017202.