This book is an excellent reference to the new stuff in Delphi 7, and still gives a worthwhile overview of the system capabilities.
It isn't a tyros book, and doesn't claim to be. That said, the text is clearly written. If you are proficient in any other modern language, this book will prove useful.
I would have preferred more detail on cross-platform development, and a cleaner separation of abstract database topics from the various implementations thereof. For example, if you're using dbExpress, it is worth ploughing thru the IBX and ADO sections also.
Nonetheless, highly recommended.