Druid tanking is pretty simple.
PvP gear works but has no Expertise and no Hit so enjoy your **** threat.
You're better off with PvE gear. Also whoever said they didn't know about the expertise talent, that's pretty much mandatory for any feral PvE spec, bear or cat.
In terms of druid tanking macros you can pretty much reduce druid tanking to 2 macros assuming you have Imp mangle, which you should as a tank cause mangle is your 2nd highest tps ability.
Mash them based on w/e you're tanking.
Macros
Single Target
/cast !Maul
/castsequence reset=3 Mangle (Bear)(), Faerie Fire (Feral)(), Lacerate, Mangle (Bear)(), Swipe (Bear)(), Faerie Fire (Feral)(), Mangle (Bear)(), Lacerate, Swipe (Bear)()
Multi Target
/cast !Maul
/cast Swipe(bear)()
If you're worried about lacerate falling off with an unlucky dodge/parry combo consider
/cast !Maul
/cast Lacerate
Remember to glyph maul so it cleaves as that helps immensely in multi-target situations. If you're never gonna tank trash and want better single target threat glyph mangle instead.
Your remaining2 glyphs should always be Frenzied Regen and Survival Instincts.
I tanked Ulduar, ToC10, ToC25, ToGC10, ToGC25 all successfully before switching to resto for ICC.