Q: How many records does a given user own in Salesforce?

A: A quickie URL hack gets your answer. Paste the following after force.com in your address bar, replacing 005ABCDEFGHIJKL with the desired user’s ID:

/setup/user/userstorageusage.jsp?id=005ABCDEFGHIJKL

the page looks like this (though presumably with many more records than you’d find in one of my Dev Sandboxes!)

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Where’d this come from? If you navigate to Setup | Data | Storage Usage, there’re two underknown sections at the bottom of the page, for “Top Users by Data Storage Usage” and “Top Users by File Storage Usage”.

Clicking a username in either one of those sections gets you the URL and page shown above.