Today's internet offers virtually unlimited free storage and distribution, if you're willing to forgo certain niceties. One of those niceties is control and limits on distribution. Virtually all free services require you to release your information under licenses that at the least allow the service provider to redistribute your materials freely.

For marketing material, this is a salesman's dream come true. You can distribute unmetered amounts of material, often with some degree of metrics to measure response. This includes, but is not limited to audio, video, text and all sorts of files.