As an original ThinkTank/More user, one of my biggest OS X hurdles was converting my (and those of my colleagues') outlines to a OS X application. After testing all the available software, we found Tao to offer the most robust feature set. I then helped Takashi Hamada with the alpha/beta testing and the product's evolution (then called "FO"). The product was very promising Unfortunately, what was once solid support has waned. Development (which people once complained resulted in too many updates) has stalled. Indeed his website that addresses "Current State of Development" hasn't been updated since 3rd June, 2007. The "shipping" version is a beta. Worst starting June 2007, the product has led to total file corruption in more than six instances. Takashi wrote that they were working on the issue, yet a year has passed and no new version has been released, and the product continues to corrupt critical data beyond recovery. Unfortunately, additional emails to Takahasi have gone unanswered. Sady, we can no longer recommend this product. While OmniOutliner seems to be the next best thing, it doesn't match Tao in several key areas, namely "Cloning" (which Omni has promised for over two years now) and ease of keyboard custom configurations. They are still stuck in 3.x releases, with no 4.0 in sight. The funny thing is that More still rocks as a mean, lean, featured outliner. To bad Dave Winer doesn't brush off the source code and release it for Leopard (seeing as how the product was abandoned by Symantec).