Shape changed and unarmed combat.

[HeyLadyOfDecay]

Is taking feats in unarmed combat usefull/adviced for when you make any sort of shape changer that has no monk lvls?

[Gouge Away]

It's not a bad idea on druids but if you're pure druid there's other feats you probably want instead like spell focuses, metamagic, expertise, maybe knockdown. Totem druids who dip another class can use those feats (but pure druid is so much better even on a totem you may want to consider it)

Shifter is another matter and you'd better read up on it because I think it's form to form. If you're talking werewolf shenanigans I dunno and if you're talking making heavy use of polymorph/shapechange you're in for some disappointment.

[Might-N-Magic]

Improved Critical (unarmed) and Epic Prowess work.
Weapon Focus (unarmed) and Epic Weapon Focus (unarmed) do NOT work (despite what the sheet says).

Every shape has a "creature weapon" it equips which doesn't work with the weapon focuses because it's a weapon.
No shape needs Improved unarmed strike to function.

[Jagel]

Unarmed feats only work for totem shapes.