The folks at my local PetSupermarket were nursing a baby squirrel the other day. One of the clerks, a teenage girl, was walking around with it clinging to her shoulder. I couldn't bring myself to pet it, though, they're such pest-ridden little things. The little baby was CUTE though, and seemed sweet enough.
I hear that even hand-raised squirrels turn mean though once they grow up.
It was odd, the squirrel I had I kept for five months before I released him. He would nip on my finger nail, but he never bit me. It was a fun experience, aside from being threatened by wildlife officials when I called for feeding advice for the squirrel.