SpiralFrog, an ad-supported website that allows visitors to download music and videos "free" of charge, was scheduled to launch this Monday in the U.S. and Canada. Here's how it works: you have to register on the site, giving (up) demographic filters such as age, gender and zip code. The site requires only that users register on the site and log in once a month, otherwise your DRM'd files are vaporized.

For all that, SpiralFrog's content won't work on your Mac or your iPod, and can only be placed on two media players or phones at a time. At launch, the service was offering more than 800,000 tracks and 3,500 music videos for download. Of all the major labels, only Universal Music Group, has licensed its music and videos to SpiralFrog.

SpiralFrog plans to give a cut of its advertising revenue to the labels, and to attract music fans who normally use online file-swapping networks to share and download music for free.

The only way I could see using the site is if SpiralFrog gave ME a share of the ad revenue.