It is simply a convinient way of communicating with me. Think of it as a built in e-mail sender for communicating directly with the developer.
How does it work?It sends a message to a webpage, and that page sends me an e-mail. Pretty simple really.Do I have to give you my e-mail address?Only if you want any kind of reply. Otherwise it is entirely anonymous, other than the IP address of your computer (or gateway) showing up in my http logs.