I love this thread too. My ds 4 is a lip licker as well as needing to touch objects with his feet - put him in an empty room with only one object and he'd manage to stand on it in preference to anywhere else in the room.
He also has one other quirk I haven't seen here yet - chewing on sleeves and collars so they end up sopping wet and stretched. Not sure why but the weird thing is I did exactly the same thing as a child, though I also used to suck my hair until my teacher in 3rd grade told me I'd go bald.
