I bought a copy of this book and have to say I am impressed. It's big, for one, at about 1000 pages. It's packed full too. The price is quite reasonable at 12.99. In another review, someone asked how it stacked up to The Artist's & Writer's Yearbook and gave this one three stars without actually having seen it. That seems like foul play to me. Try reading the book before you actually assign it a rating, hmm?
However - since the question was asked - I own both and must say I prefer this one. I'm not sure how they can afford to do it, but I'm glad they did. As noted, the book is big - about 160 pages larger than The Artist's & Writer's Yearbook and it has many more entries. Very comprehensive as well. Not only does each entry have updated contact info, etc., they also provide insider info, as well as tips for tailoring your work properly for the magazine or book publisher that you're interested in. The book also covers broadcast media, agents, writing organizations, writer's groups, competitions, etc. There's also a lengthy overview of how the publishing industry works (about 100 pages worth of material right there).
Two other big benefits: This book is less expensive than every other market book / writer's handbook I could find AND it has this special web site that you can access for a month that provides all the entries from the book online, in addition to a bunch of others that they couldn't fit into the book. It's a promotional thing, I guess, but you can continue on the web site longer if you want.
Great foreword by Peter Ackroyd by the way. Really very inspiring.