ER Diagram for MS CRM?

[DougStevens]

Here's the thing, we have implemented MS CRM at our office. I am tasked with creating custom reports in Crystal. I am poking around, hunting down fields all over the place to look for the information that I need.

Is there a ER diagram of MS CRM? Something that would show the default fields, where they are found, and how the entities relate to one another.

-Doug S