Michael Cecchettelli, author of Crossed Keys, has recently released Mardukite Magick, an ebook covering a technique for Working the 50 Names of Marduk in harmony with the Jupiter current. It's available at his blog, another thing you should check out.
This book is quick and to the point, and I enjoyed it immensely. It's everything a book about magic should be, in my opinion. It provides the basics of what you need to know, and then it jumps right into the magical rites. It forms the framework, and then it fleshes it out to the point where you can start filling in the details on your own.
This is not as much a book about Marduk as it is a book that puts you in contact with Marduk so you can find out about him first hand. That's awesome. It reminds me a lot of my own Modern Angelic Grimoire, in that it provides a quick and easy reference guide to everything you need to get started, tells a little about personal experiences, but is mostly focused on getting you in touch with the entities so you can get on with doing the Work yourself.
And I really love the tone Michael has in his writings. He's got this formal informality about his writing that is both authoritative and yet approachable at the same time. In this book, he focuses on the traditional Sumerian sources for his information, and the ritual format and style flows readily and easily. This approach doesn't take a lot of specialized tools, and the rites themselves are fun. Just reading through them, I felt the Jupiter Current Michael is tapping begin to flow.
My favorite part is the table at the end with the traditional 50 names of Marduk and the description of each. It's chock full of goodness and insight into the many facets of this Jovian deity. I found things in there that I will be incorporating into my own Work that I hadn't thought of, like how there's a facet of the Jupiter current that sustains all things all the time, an ongoing maintenance that I hadn't thought about before.
All in all, this book provides the information you need to establish a Working relationship with the Jupiter Current through the God Marduk, and the details you need to develop that relationship over time. I can easily see a magician immersing themselves in this system for years, and still only just scratching the surface of its potential.