However, unlike many MMOs that give you a set list of recipes based on your crafting level and then limit you to crafting only those recipes, Guild Wars 2's system allows players to experiment with different combinations of materials to see if they form a new recipe. Only guy on the server who's figured out how to make that badass warhammer? Don't tell anyone and monopolize the market!
Also gone are the days of skill points. Rather than giving crafting recipes a somewhat random chance to give you a skill-up, Guild Wars 2's crafting system provides you with an experience bar for your tradeskill, with each completed recipe providing a set amount of experience toward the next level.
But what if you're not happy with your profession choices? While the game only allows you to have two active professions at any given time, you're able to freely swap one profession for another while retaining progress made in your former profession. So if you want to drop your level 50 profession to mess around with another, you can pick back up where you left off at a later time.
For the developer commentary and a whopping 20 minutes of hands-on time with two different professions, hop on past the cut for the full video.
[Thanks to Paul for the tip!]