Currently

Alchemy/mining
alchemy/skinning
alchemy/herbing
alchemy/jewelcrafting
alchemy/enchanting

did alchemy for the 5x transmute spec which has been rolling it in and i expect it to bring in more when wrath comes out of the wotlk equivalent primal mights are in high demand.

also alchemy is a good choice imo for 2nd profession for those arena junkies. having a pot in arena will be amazing.

also, currently you get 3 major 3 minor glyph slots, and if you pick up inscription you only get an extra minor glyph slot. personally, i dont think its worth it. unless you want some of the bop items it created. im going to pick up inscription on an alt that i soloplay once inawhile to just have an inscriptionist.