Here are the basics. In Engineering, you make stuff to make stuff.
Of course, one of the appeals of Engineering are the things that make other things go BOOM. It's certainly why I went Goblin Engineering!
I'm not so sure BoP guns are such a great idea. The epic gun looks like a best-in-slot for tanks, though...
One great move by Blizzard was to make Engineering effects "enchant"-like. Finally, there's also something for belts!
Here are a few items that just might sell to other players. Industrious Engineers can probably make a tidy profit.
Only one of the goggles seem done, focused on tanking. There are others for the different armor types, albeit with no stats yet.
And of course... there's the fun stuff. From a portable mailbox (with a 1 day cooldown) to Gnomish X-Ray Specs... Engineering has everything!