One item I would say that any new parent needs is a bath thermometer considering how sensitive newborns are to temperature. There are lots and lots of different ones out there, but I believe that this blows all the bog standard ones strait out of the water (sorry, couldn't resist).
Using a round, easy-to-read screen (about the size of a 50p piece), the Duckymeter screen lights up either blue, green or red to indicated temperature. Blue is cold, green just right and red too hot. The reading is displayed in farenieght and is clear enough to read from a standing position above the bathtub.
The thermometer is of a reasonably large size, bigger than an average rubber duck and has no buttons or switches, it's sensor activated. The LED screen remains constant whilst in the water, checking the temperature every second. The display will light up blue if the water temperature falls below 95 degrees and red if it goes above 102.2, leaving a reading anywhere between firmly in the green, and therefore safe, area.
Moo is hugely fond of all of her bath toys (and will often be found playing with them on the bathroom floor in the middle of the day), and when bathing with Bear, she gets a lot of enjoyment out of this duck thermometer! For me I find it very reassuring and takes a lot of the doubting I had with my eldest over the temperature of the water, I had been bathing her in water that was too cold and had no idea so it's great to have the thermometer constantly updating the water temperature for me.