I recently had an issue from a customer regarding figuring out the correct syntax to get at a few nodes in an XML object that had namespaces using e4x. Now I don’t know about you, but if I don’t use e4x often, I forget things and get rusty. If your e4x-foo is weak, here are a few references that I found useful:

http://www.darronschall.com/weblog/archives/000223.cfm
(In fact Darren has a few e4x entries aside from this one.)

http://www.partlyhuman.com/blog/roger/as3-e4x-rundown

Hope this helps,

-Kyle