Simon and Lewis talk about the crafting and gathering system in Guild Wars 2.
This video isn't commentated, and it needs to be. Still, it is a good video showing someone tampering with the crafting system in GW2.
Quality Assurance manager shows off Guild Wars 2's crafting system in the game.
RedRhino takes a look at the crafting system and how those items will balance out with ones that are dropped from mobs. He also looks at how you will go about collecting materials.