When people start whinging about the HTML markup for your thing, you know you're on to something. Early on, we got a guy complaining loudly about how Twiddla s

When people start whinging about the HTML markup for your thing, you know you're on to something. Early on, we got a guy complaining loudly about how Twiddla sucked because we had put a DIV into the HEAD tag to display a loading message. Not sure exactly how it affected his user experience, but there you go. If the best criticism that people can come up with is about a piece that nobody can ever see or be affected by, you're probably doing something right.