I've been playing the "Dynamic 3...Qd6" variation for a number of years now, as recommended in Gary Lane's excellent "Ideas Behind Modern Chess Openings: Black". I was hooked pretty much straight away. I have also seen Andrew Martin's DVD The Scandinavian the Easy Way (both Edition 1 and Edition 2), which recommends the 3...Qd6 variation. I have also read the Scandinavian works by Plaskett and Emms with a view to playing the variation. I also own both editions of Michael Melts' "Dynamic 3...Qd6" excellent work. In summary, I would say that if you want to play this variation, then Lane is a good primer but a little short on detail, and Melts is the bible (definitive content but mainly unreadable). Houska's work falls somewhere in the middle and is therefore essential reading for the 3...Qd6 player. I particularly liked her section on the 6.g3 line which was originally 'refuted' but now found to be alive and kicking. Incidentally, Andrew Martin felt the need to re-issue his DVD after the line against 6.g3 was found wanting! Both Houska and Martin give the same general treatment of this critical line, but Houska's (being a book, not a DVD) is the more thorough. Also, she gives an excellent treatment of the critical 1.e4 d5 2.exd5 Qxd5 3.Nf3 line, which has caused me problems in the past, but no more. Finally, the book is basically divided into three sections, the normal 3...Qa5, the dynamic 3...Qd6 and 2...Nf6. I've only read the 3...Qd6 part as that's what I play, but I was impressed that she has managed such a complete coverage and it's a relatively large book for Starting Out. Incidentally, I would not recommend the Plaskett and Emms books if you intend 3...Qd6, but they are generally good otherwise. In summary, essential reading if you want to play 3...Qd6 (oh, and earlier deviations are also catered for, which Melts ignores.)