I could be way off base, but I'm going to offer my two cents anyway.
For an elemental shammy I would recommend taking leatherworking and then specializing in Dragonscale Leatherworking over BS. The epic craftables in Dragonscale LW look like they're much better suited to a shammy than the BS equivalents. I'm thinking those are more for Pally's and Warriors, and sometimes Hunters.
The weapons you can make with BS are wicked nice though too.
I would say go through the list of items in each profesion on the left and see for yourself. If you think you'll be more into the weapons, then go BS, but as an elemental shammy, your weapon will probably be secondary to your spells (but not unimportant by any means). If you want better armor for your class, then consider the LW.
Either way, good luck and have fun!