I needed a lightweight method of creating PDF documents on Windows recently. I turned to an old standby, PDFCreator (http://sourceforge.net/projects/pdfcreator/). I wasn't aware the project now includes crapware called "PDFForge Toolbar." I noticed something was fishy when I mistyped a URL in Firefox. Instead of the error page, I received a Yahoo! Search Results page with my typo used as the search term. Apparently, their toolbar even diverts the browser away from the OpenDNS help page that appears when a DNS query is invalid or blocked. By the way, this is a company policy where I work, not something I configured for myself.
Here is more information about the crapware:
http://en.wikipedia.org/wiki/PDFCreator#Controversial_inclusion_of_toolbar
I took a screenshot of the Firefox extension. Adjacent to the PDFForge Toolbar is "Search Settings Plugin" that "protects your default search settings." That really is the final insult. It would be nice if SourceForge had a warning icon for projects that contain additional commercial software that treats users as click revenue sources.