Blizzard are going to be reworking the professions with the next content patch, check out this forum post for a list of what they will be doing to each one.

We have taken the time to put together a brief preview of the Profession changes for the upcoming content patch. This list does not contain all of the upcoming changes, but instead gives a brief look at what is to come.
 

Check out this post on some of the new stuff found in the burning crusade for some of the professions. New spells, enchants etc..

Post contains info for Burning Crusade professions of: Herbalism, Alchemy, Leatherworking, Enchanting, Jewelcrafting and Blacksmithing.

Check it out, nice post !