Druids get natures bond which can and usually is used to receive an Animal Companion. If the druid takes Spirit's Gift he can then infuse his companion to use the Spirit Ability from the Shaman's class in the ACG, or that's what I'm assuming at this time. Now under the Spirits Ability it says A shaman can use this ability 3+ charisma modifier. Some say 1/2 the Shamans level so on and so forth. Would it change to druid levels and wisdom if this feat was taken by a druid or would it remain charisma based?
long story short if any class other than a shaman took the feat (can they even?) what's the resulting changes the how animal spirit abilities read (or are there none don't have a shaman level go pound salt kid.)
You don't get a Shaman Spirit, but your animal companion gets the bonus listed under the Spirit Animal portion of each spirit section.
For example Battle Spirit does this:
Spirit Animal: The shaman's spirit animal looks like a fiercer version of its species, with rippling muscles and a stockier frame. It gains a +2 natural armor bonus to AC. If it already has a natural armor bonus, the bonus increases by 2 instead.
The bones spirit does this:
Spirit Animal: The shaman's spirit animal gives off a ghostly glow and seems nearly transparent. The animal is under the constant effects of blur, with a caster level equal to the shaman's level.
You do not gain any other abilities.
Edit: There is also not a number of times you can activate it, but a constant effect.