I can’t remember where I read this but it’s darn useful and I used it just this week when I need to put in the discovery service into the CRM/NAV Connector. For those of you who have never used the CRM/NAV connector, be warned it’s a tricky beast to use.
Anyway if you want to find the discovery or organization service for your CRM 2011 deployment and this works for online or on premise then all you need to do is go to
SETTINGS
Customization
Developer Resources
You will then be shown a page with all your service endpoints on.
you might not need it now but sometime in the future you will remember this blog post and be able to find the Discovery service when you need to.
Hosk's Dynamic Blog 
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