If you're into, or getting into, .NET programming with Delphi, this is a good reference. I am a professional programmer, and Delphi is one of 4 languages I use on a regular basis. I bought this book, and Cantu's book, about two months ago to ease into ASP.NET from 12 years of VCL programming. Both books are very helpful, but my Pacheco book is way more dog-eared than the Cantu book, so that says something right there.
