The new contenders that I know of are as follows:NewRelic. NewRelic has been building relationships with hosting services for other languages they already support, which provide people who sign up with that hosting service free access to their Bronze level subscription. The latest of these announced was for a PHP web hosting service. So, imagine how things will be if this sort of tool becomes available for the Python web community. As I say, looking to be an awesome year for Python web hosting.
And yes, some will say this is just an unashamed blatant plug for NewRelic just because I am working there now. Seriously though, I reckon this influx of new Python web hosting services, and the monitoring tools to match, is going to be a really great thing for the Python web community. I know I have not been this excited about something for a very very long time. :-)