Something I was planning on building but never got round - if anyone wants to do it then feel free to use this idea.

Lots of companies really have no idea what javascript is being inserted into their websites - marketing teams add all sorts of crazy scripts that don't get vetted by anyone and are often loaded dynamically and can be changed without anyone knowing.

A service that monitors a site and flags up when the code changes - even better if it actually scans and flags up malicious code.