Various comments for this run as 'good but not Snow Crash' 'great but flawed' 'good but not Cryptonomicon'. This book is simply superb. I thoroughly enjoyed all of his other books, but for me this is the pinnacle. A world struggling to get to grips with the differences that seperate us, uses a tribal approach to create regions for people to live their chosen lives. This politcal world is imbued with Stephenson's usual array of amazing technology, and extraordinary concepts. The most powerful of these is a book with the ability to adapts its lessons instantaneously to its reader's needs, and a little girl with power to reshape everything. I loved the (for me very real) possiblities D/A opens up, and I want one of those books!!