Question : VBA Book

What book would you recommend that would help develop VBA skills?

Answer : VBA Book

More:

The defacto standard:
http://www.developershandbook.com   Must have.

"Fixing Access Annoyances"
Phil Mitchell and Evan Callahan
O'Reilly

In the back ... there is a great reference appendix ...with functions, macro actions etc.

PLUS ... the book itself is VERY cool  
list price $20

Also ... another cool book ...

"Access Hacks"
Ken Bluttman
O'Reilly

SQL Queries for Mere Mortals - Second Edition
http://my.safaribooksonline.com/9780321444431
by John L. Viescas; Michael J. Hernandez

Expert One-on-One: Microsoft Access Application Development
by Helen Feddema  
ISBN:0764559044
Wrox Press © 2004

"Microsoft Jet Database Engine Programmer's Guide "
http://www.amazon.com/Microsoft-Database-Programmers-Professional-Editions/dp/1572313420

And .... loads of good information here:
http://www.fmsinc.com/TPapers/#CurrentAccess

http://msdn.microsoft.com/en-us/library/aa296748(office.11).aspx

And some cool stuff here:

http://www.datapigtechnologies.com/AccessMain.htm

http://www.databasedev.co.uk