Recommended Excel books

Excel

• Excel Formulas by John Walkenbach
• Excel Bible by John Walkenbach
• Excel Charts by John Walkenbach

Programming, macros and VBA

• Excel VBA Programming for Dummies by John Walkenbach
• Professional Excel Development Second Edition: The Definitive Guide to Developing Applications Using Microsoft Excel and VBA and .NET by Stephen Bullen
• Excel VBA Programmer's Reference by John Green, Stephen Bullen, Rob Bovey and Michael Alexander
• Excel Power Programming with VBA by John Walkenbach
• Excel VBA Programmer's Reference by Paul T. Kimmel, Stephen Bullen, John Green, and Rob Bovey

A few books that are on my shelf

• Professional Excel Development: The Definitive Guide to Developing Applications Using Microsoft Excel and VBA by Stephen Bullen
• Professional Excel Development Second Edition: The Definitive Guide to Developing Applications Using Microsoft Excel and VBA and .NET by Stephen Bullen
• Excel 2007 VBA Programmer's Reference by John Green, Stephen Bullen, Rob Bovey and Michael Alexander
• Excel 2003 VBA Programmer's Reference by Paul T. Kimmel, Stephen Bullen, John Green, and Rob Bovey
• Excel 2003 Power Programming with VBA by John Walkenbach
• Office XP Developer's Guide by Microsoft

Books where ASAP Utilities is recommended

• Excel 2010 Grand Cru (ASAP Utilities is listed on page 622)
• Excel annoyances by Curtis Frye (ASAP Utilities is listed on page 10)
• Excel pocket guide by Curt Frye (ASAP Utilities is listed on page 103)