We would like to express our love and gratitude to our wives for encouraging us to finish this book. We are also grateful to Apress for giving us the opportunity to write second edition about what we love to do so that we could share it with the world. The staff at Apress made this book possible by spending many days and nights reviewing and editing the book to meet the tight deadline. Ewan Buckingham provided us with this unique opportunity to share our knowledge. Thank you, Ewan, for believing in us. Also we would like to show our appreciation to the coordinating editor, Jennifer Blackwell, and staff members James Markham, Fabio Claudio Ferracchiati, and Mary Behr. When the first edition was published, we also realized that there were Apress staff members in the marketing department promoting the book; we would like to thank Lisa Lau and the marketing department and Simon Yu for helping us to get in contact with the user groups for speaking engagements.

We also like to thank those who sent us e-mail with comments and those who blogged about our books on the Web with kind remarks. Many online communities helped us improve upon our first edition by offering valuable feedback and we used that feedback to make the second edition better.