One of my nice little niche items has been scrolls of Enchant Off-Hand Superior Intellect, which has raised the intellect on off-hand items (including shields) 100 intellect. It has been announced that they will be nerfed in 4.0.6 to only +40 intellect. While it will still be the best choice enchant for shields and off-hands for casters, I expect a drop in sales to occur. Here are my recommendations:
Sell off your existing scrolls now before they drop.
Expect Staves to raise in demand: I'm looking at you, Chelley's Staff of Dark Mending. If you see one for cheap enough on your AH it may be worth investing in.
Cheers - Brouck