An Electric Fan

The soft white noise That an electric fan emits is  recommended by many pediatricians to aide tired and fussy babies to sleep. The soothing sound will lull your baby to sleep in no time.

The Clothes Dryer

The calming sound your clothes dryer, although irritating to you, are sure to relax your fussy baby. The gentle hum combined with the soft, rhythmic tumble of the clothes will put baby right to sleep.

Hair Dryer

This is one of the more surprising sounds on the list. However, parents who have tried it will tell you there's nothing better.

A Calming Ocean Surf

While for us a good surf can be exhilarating, the soothing sounds of the ocean are  layered with soothing sounds of the womb that create a calming sound for babies.

Running Water

The hypnotic sound of running water masks out unwanted noises as it sweetly lulls your baby to sleep naturally.

Relaxing River

This sound simulates a float in mama's womb. Your baby will feel this soothing sound combo wash over them. A sensation that will help create a secure and natural sleep.

Steady Rain

You understand how hard it is to get out of bed when there is a nice steady rain outside. There's nothing more relaxing. Your baby will feel the same with a simulated steady rain.

Vacuum

Your baby will love the soothing vacuum cleaner sounds. This surprisingly soothing sound has been known to relieve colic and help your baby sleep better than ever.

Womb Sounds

Womb sounds are great for helping any baby fall asleep. Your baby will miss the the secure environment of the womb and there is no better way to help them sleep through the night.

You can find any of these wonderful baby soothing sounds on CD or MP3 on many sights online. one of the best ones that I found was http://www.pediasleep.com/baby.html. You can test drive any of these sounds before deciding on any of them. you can also simulate many of them in your own home. 

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Information paraphrased from http://www.pediasleep.com/baby.html