It looks like a great service, especially because it is free, and I have lots of domains to monitor that I might not visit personally very often.
I would love to see Widgets for other services.
It is another service that provides RSS feeds of valuable personal data I am sure you will want to share.
The RSS Feeds are not protected by RSS Authentication, thus you can share them from Google Reader.
Even if you had RSS Authentication, you could still share the data from other RSS Readers without any warning that it is data you might not intend sharing.
RSS is not just about sharing blog entries. The potential of RSS is much greater, but some level of automatic flagging of feeds “noshare” needs to be implemented.
One good way to use the Montastic data might be to add the RSS feed to the Admin of all your WordPress Installations.