http://www.switchonthecode.com/tutorials/flex-snippet-tutorial-bindable-meta-tag-part-3

talk about bindable tag

http://www.casadirocco.nl/2009/09/the-event-meta-tag-in-actionscript-3-and-flex-builder.html

talk about event tag

http://www.boostworthy.com/blog/?p=157

general brief of the metatag

http://www.bit-101.com/blog/?p=946

frame tag, for making preloader for flex