I found this app mentioned on another thread, and thought I'd take a look at it. It fills the same role as Trapster, but also reports slow traffic movement without any intention from the operator. I have been looking for something like this since Trapster has never really been stable on my Android phone.
If you'd like to check out the website, simply follow the link. It is available for iPhone, Android, Blackberry, and Nokia (I don't exactly understand the Nokia)