I've been told that ferrets have a personality that is about halfway between that of a cat and a dog. I held one at the pet store a while back and was surprised at how amusing the little guy was - it was a creature with a
definite personality. Then again, I've had rats as pets as well, and find them to be very charming.
One misconception about ferrets is that they're "wild" animals. There are very few truly "wild" ferrets, and they are also NOT domesticated weasels. They have been kept as domestic animals for a very, very long time (used as rodent control much like cats) and thus are no more "wild" than your average dog or house cat. Apparently you'd probably never find a feral ferret either, because they wouldn't do very well if they got out and had to survive on their own.
I've heard that they take a lot of patience and ferret-proofing, but are great pets if you're willing to keep up the ownership end of the bargain. The only reasons I haven't ventured into ferret ownership are 1) they have a fairly musky smell that I'm not sure I like, and 2) their lifespan is fairly short (~5 to 7 years) and they are prone to some diseases and cancers. After losing multiple rats to mammary tumors, I've avoided short-lifespanned housepets because I just get too attached to bid them farewell after only a couple of years.

Laurel