The Linux Action Show has a bit about urlwatch at about 13:40 min from the start: http://youtu.be/r9qeQ7o33GE?t=13m40s

It's supposed to be able to "Watch web pages and arbitrary URLs for changes". I want to know if anyone has used it on sites that require a login and password. For example, I need to know when my electricity bill is available for online payment. Currently, I can know that the bill is available only by logging in and checking ever so often. But reading the man page doesn't indicate that what I want is possible.