Danny Sullivan reported last week that the Traffic Power case against SEO Book filed last August has been dismissed. The appeal time for Traffic Power has passed, "the case was tossed out on February 13, so the 30 period for appeal has elapsed."
I suspect, Matt Cutts and Google's official confirmation of Traffic Power ban had something to do with it. But I do not have any confirmation from either side.
Forum discussion continued at Search Engine Watch Forums.