the best book (for Apex)

Go out right now and get 'Pro Oracle Application Express', by John Edward Scott and Scott Spendolini. It is published by Apress. I picked it up for $39.99 (CAN) from chapters.ca a while ago and it is worth every cent. More than that actually, so I feel I got a great deal.

Or, you can sign up for DBCON's excellent training courses; they will send you the book in PDF format. Personally, I like reading books made of paper still, but having it in PDF format means I can share with coworkers and keep my 'real' copy in pristine shape.