gotoAndLearn Video Tutorial on AS3 & XML (link)
Example files from the tutorial (link)
Example files from the book Learning Actionscript 3 (link)
Wikipedia entry on XML (link)
W3 tutorial on XML (link)
Going Further: Using External Libraries
List of APIs from Adobe (link)
Google Maps (examples) (link)
AS 3 Flickr API (link)
Papervision (link) installing (link)