The 'My Staff' quicklist allows administrators to filter their dashboard with data only about a specified staff member (or school group if you are a district administrator).
How does it work?
By clicking on a name in the list, you'll notice the entire dashboard updates to reflect just that user's (or group's) data. You can zoom back out by simply clicking the Dashboard tab on your Navigation Toolbar.
Pro-tip: By default, the quicklist is ordered alphabetically, but will show your 'favorites' (i.e. the most frequently-accessed staff or groups) at the top of the list!