Inquisitor 3 is a free Safari plugin that allows you to search the internet in a spotlight-akin fashion, it displays results as you type them, and makes searching the net a whole load easier.
With the release of version 3 a year ago, the application became "Freeware", this isn't knews to alot of you but earlier this week TUAW's Brett Terpstra discovered that certain search terms returned some Amazon.com affiliate links, and there has since been an uproar by people in response to this.
Personally I don't see a problem with this, I use Inquisitor 3 with Safari everyday, and have only seen one affiliate link in my time using it, and in all honesty for an application as good as Inquisitor I can't complain about an affiliate link or two, as before version 3 it was a Licensable product.