I use a site for downloading legal music which is ad revenue funded. The url is http://spiralfrog.com. The site has a great selection of older music as well as newer indie and major labels.
Because they use ad based revenue generation to pay the artist's license fee, they want you to hang around the site with stick eyeballs to see the ads as much as possible. To accomplish this they ask that you type a captcha as you start the first download and then click on a next button after each download in the list completes.
In order to automate the clicking of the next button, I wrote a dot net windows app that uses the built in IE based browser control to display the spiralfrog web site and click the next button automagically whenever it appears on the page.
The installation uses the click once install so that you must use IE to install the program.