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Sale Tracked(TM) is very simple to install and an easy to use tool that will determine the website your visitor came from and notify you after the sale has been made. Sale Tracked(TM) will even let you know which keywords were used if the sale resulted from a search engine. If you pay for web advertising, you can't afford not to use Sale Tracked(TM).
Price: $49.95

Record information about your visitor like IP address and host name, Screen resolution, browser and operating system, the referring page, search engine and keyword used, spiders, bookmarks and 403,404 errors generated. Ability to generate its own log files using SSI or Javascript. Easy to install and zero maintenance.
Price: Freeware/$29.95