Here's a download link to the Pink Noise - Niagra w/ 1.5 minute silence track I made. It's 195 MB and 19:22 long. It has volume changes also, so keep it at moderate listening levels before playing the track.
Thanks for that. I'm using your file right now to burn in a new set of headphones.
In case someone is curious, this site does an OK job of explaining what pink noise is. It also offers some links to pink noise files and noise generators.
A pretty nice browser based noise generator can be found here. Don't forget to set the preset to 'pink noise' when burning in your 'phones.