Finaly it will be there, a complete guide for NAV development written by an indepentant party. I can personaly recommend this book, I know David Studebaker very well and have reviewed the book for him. The book is very complete and contains very valuable information for beginners as well as tips for more advanced developers. The normal price is $54.99 but there is a 20% pre-order disount. Link: http://www.packtpub.com/Microsoft-.NET-Dynamics-NAV-5.0-ERP-Navision/book