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EXCEL & VBA
By an Amazon.com customer
Definitive Guide to Excel VBADefinitive Guide to Excel VBA by Michael Kofler
Buy used from: $3.37
Candid, complete and advanced appraisal of new features and older versions
Microsoft Excel 97 Developer's HandbookMicrosoft Excel 97 Developer's Handbook by Eric Wells
Buy used from: $0.39
Four integrated applications of increasing complexity, very complete and useful
Running Microsoft Excel 97 (Running)Running Microsoft Excel 97 (Running) by Mark Dodge
Buy used from: $0.01
Excellent coverage of features and illuminating final example combining Web, Word and VBA
Excel for Scientists and EngineersExcel for Scientists and Engineers by William J. Orvis
Buy used from: $18.00
best available intro to spreadsheet use, dated, but not a drawback for older features
VB and VBA in a Nutshell: The LanguagesVB and VBA in a Nutshell: The Languages by Paul Lomax
Buy new: $19.77 / Used from: $1.12
Good summary of language, no discussion of object models
Excel 2000 VBA Programmers ReferenceExcel 2000 VBA Programmers Reference by John Green
Buy used from: $0.52
Compact summary of VBA with very good intro to object model
Using Excel Visual Basic for Applications (User Friendly Reference)Using Excel Visual Basic for Applications (User Friendly Reference) by Elisabeth Boonin
Buy new: $24.30 / Used from: $0.78
Out of date, but best organized intro to VBA at a VERY basic level
Programming Microsoft  Visual Basic  6.0 (Mps)Programming Microsoft Visual Basic 6.0 (Mps) by Francesco Balena
Buy new: $39.10 / Used from: $5.00
VB, not VBA (no object model), advanced, often elliptic, but stimulating and imaginative
Microsoft® Excel 2000 Power Programming with VBAMicrosoft® Excel 2000 Power Programming with VBA by John Walkenbach
Buy new: $34.99 / Used from: $4.80
Hodgepodge of examples, useful if you can FIND the scrap of code you want