Yeah, we have seen purpletrail. As the article said, we're going for simple and straightforward. We're also pretty big believers that "more features" does not mean something is better.
Similarly, have y'all seen mobaganda.com? It is doing the simple == better thing, as well. I notice you guys seem (I haven't actually used either site yet) to have a few more features. I'd be interested to hear your thoughts.