I first found Simply Noise when we went on a mini-family vacation and forgot our “white noise” sound machine that I need our little one needs to sleep well at night.
It is a very simple website that will continuously play white noise for as long as you need it to! You can adjust the volume right there on the Simply Noise site, adjust the type of noise that’s played (you can select white, pink, or brown noise), and adjust whether the sound oscillates so that it sounds like waves in the background.
I always use this site now when I stay at a hotel with unlimited internet access and it helps me to sleep like a rock!
Anyway, since I’m using the site during my stay in San Francisco for Save Up ’09 I thought I would share it with you all! 
Wow! Thanks for the white noise info!