Expert Oracle Application Express 2nd Edition seems to be available at Apress. Buy this book and support the charity project in memory of Carl Backstrom and Scott Spadafore (previous members of the APEX Team). Please note that all funds will be donated to the families of these two great men.
This is a new blog on APEX. I expect a lots of good stuff there in the future. The last example describes how to modify the Page Designer and move the panes, adjust the layout and simplify the development of an application since accessing element attributes is much easier that way. I think this is worth of looking at and maybe the APEX team considers this as an improvement for the future release.
Oracle Application Express 5.0.1 is now released and available for download. If you wish to download the full release of Oracle Application Express 5.0.1, you can get it from the Downloads page on OTN.
This example is showing how to open a Modal Page from any element in your application. It is easy to get it working using some standards like a button or a link in a report. However, it is not 100% clear how to get it working with some other elements which don't have the redirect functionality built in (item, region title, custom links, etc.). This example is also showing how to get the success message displayed on the parent page after closing of the Modal Page.