It would be very useful to be able to attach instructions and comments to items (components, pages, structure groups, bundles etc.) in the content explorer.  This info would then be visible via the item's right-click context menu, or perhaps even as a tooltip when hovering over the item.

This feature could be used to give instructions, tips and reminders to content managers related to each item.  It might also be used for commenting. Some examples:

- "This component is meant to do X on page Y."

- "This page is optional. If you use it, please make sure you also do X and Y."

- "This component is obsolete and pending deletion. It has been replaced by TCM:XYZ"

- "Remember to replace the placeholder phone number in this component with a real one."

...and so forth.

Even a short plain text field would suffice for this purpose, although links could also be useful (for example a link to some relevant materials).