RankTracer.com is looking to start building a repository of information on the effectiveness of various marketing, advertising, and review services. They do this by tracking the hourly sales rank of a book or books before, during, and after a promotion (blog review, press release, etc.).
They are looking for published authors who are planning some form of bookpromotion. They will provide complimentary subscriptions for a month or so to anyone who wants to see the effect of a given initiative.
If you are interested in this free test, email email@example.com.
For more information (they also have Amazon tracking widgets), check out: <http://www.ranktracer.com/.>
(Per John Kremer)