Firms Using Scrum - Please add/modify
There is a wiki for your use: ScrumCommunity.pbwiki.com
Many resources there. Please add to them.
More specifically: Firms Using Scrum.
This is an excellent resource for community.
Please add or update your information:
From that page you go to a Google Doc that all should have access to.
PS. I have heard of no untoward things happening from making this truth known. I can tell you that lots and lots of firms are using Scrum a bit or a lot and not reporting on this list. I know this for a fact myself.