All the tabs in Workflow have a "Created On" field, EXCEPT Functions.  Why?  Even more useful would be a "Last Updated".   

Adding "Last Updated" would help code management immensely.  Many of us develop using a copy a restored back-up because the limitations of the Sandbox.  A "last updated" would let us know every function we touched since the back-up we restored.

Yes, we all try to keep a list of modifications, but sometimes we forget that we changed one little thing in a function.  You know, you change something and it works and then the phone rings, dog barks, etc. 

Then we move all the code over that we *think* we changed, but then things still don't work.  After an hour, we realize we missed that small change we made to a function.

This super-easy change would address this issue 100%.