I'm thinking the same as Grokk, to be honest. It's not exactly a big secret. I don't really know most crafters, to be honest, but just from what I've seen...
Goldsmiths are seemingly unheard of. There is one very good one, I believe, but he doesn't show his face ingame anymore. (Gem cutting usually goes along with goldsmithing)
I think there were two novice brewers ingame at one point, but I'm not sure if they're around anymore. That'd also be a good craft to go. Glassblowing might go hand in hand with this (there aren't many of those, either).
Cooks, smiths, and tailors seem to make up the majority of craftsmen. Masters of these crafts are much harder to come by, but I'd say smithing has the most, with cooking in a close second. I'm not sure if there's an active master tailor ingame at the moment. There seem to be less woodworkers than the said three (handles seem to be in high demand), but there are a few who come ingame every once in a while.
Any of the "collection" crafts are usually filled by their respective "creation" craft. But, I'm sure smiths could always use more ores/ingots, crafters more wood/boards/branches/boughs, tailors more cloth/thread, etc.
I'm not sure if I'm entirely right, so don't take my word for it. If I'm missing anything, someone else feel free to add. It's late. >.<