The first one is a great reference, but was published in 1998. Since then the art and science of building the data warehouse has matured significantly. I don't think that the word BI really existed in 1998. . . Actually I don't know since I didn't start working in the DW/BI world until 1999 with Brio, then Business Objects.
The original had a lot of great material for organizing the pro cess around preparing for, implementing and maintaining the data warehouse, including a nice set of documents. Here is a link to the new book on Amazon.