I'm considering conducting another experiment with pricing. In the course of the last experiment I noted little to no difference in my sales. Of course, my sales are still slow enough that I have only a few data points to go on, and chances are price isn't really influencing them in the first place.
This time, however, I may accompany the pricing experiment with a few announcements on various boards and social networkings sites. It's been over six months since the book was released and I rarely mentioned it (save here on the blog) - I figure I've earned myself the right to do a little advertising.