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Rich Schiesser: IT Systems Management: Designing, Implementing, and Managing World-Class Infrastructures
To all the CEO's out there - read this book, then take a long, hard look at your IT department. (IT managers, read this book before your CEO does.)

Jesse James Garrett: The Elements of User Experience: User-Centered Design for the Web
Light read, but enjoyable. Recommended for anyone (technical or non-technical) involved in a web applicaton project.

Ralph Kimball: The Data Warehouse ETL Toolkit: Practical Techniques for Extracting, Cleanin
Make this the first book you read on data warehousing.

Shilpa Lawande: Oracle 10g Data Warehousing
This is an amazing book by an amazing technical author. A must-read for dba's involved with Oracle data warehouseing projects.

Simon Robinson: Professional C# (Programmer to Programmer)
Aimed at experienced programmers, this book is remarkably complete.

Laura Lemay: Sams Teach Yourself Perl in 21 Days (2nd Edition)
If you've worked with any scripting languages before, this book will actually teach you in 5 days.