You can bear tank in almost the same manner as a prot warrior or pally. Most of the mentioned methods will work with a bear. As for Ushers, it's been mentioned you can grounding totem the Ice Tomb (I've seen it work, checked the combat log etc.) Shackle one, put up a grounding totem and you're solid.
Any plate/mail can do Netherspite's red beam for ya, just switch them out (that shaman that is grounding totem and your pally healer for instance can switch out and you can dance your phase in and out).
You should have an easier time w/ skeletons on Nightbane than a warrior, and can just Fear Ward or Tremor Totem through the fears and what not. Other than that... Moroes? I've not tried it but if the dual-tanking of an add and moroes works to break gouge, you win.
Most other stuff is a 1 tank fight anyway, and the ushers are the only trash you'd have to worry about, and that's been covered. Is there any fight in particular you're not sure how to do as a bear?