The best teethers..?

[SOKelly]

My sister-in-law is having teething troubles with her DD, 4 months old. Wanted to buy her something new and interesting as she's already onto all of the Tommee and Philips teethers suitable for DDs age. Maybe something a bit more fun?
Any good suggestions ?

Friend swears by Sophie the Giraffe - you can get from Amazon

We had this thing given to us by a friend which went by the name of 'shakey rattley think' in our house - can't see it for sale anywhere any more though - sorry.