This one makes me happy, it's the little things.
- Poll duplex settings and alert on possible mismatches
I know, I know -- one would think that in Q3 2014 there would be very few links in an enterprise (of any size!) that weren't using auto-negotiate, but I have some customers from a previous life that insisted on hard-coding everything! The result, as you can suspect, was a boatload of odd network performance issues that were only found while on the device itself.