You could kind of do it in Outlook by creating a public folder with tasks in it, and having the boss set the priority level.

We use Slinkset to do democratic prioritization.

slinkset.com

Slinkset is very cool, I was playing with it earlier today but probably should dive into it a bit more to see what all it can do.

Can you not do it with Google Docs? You can share a document with the employee and use a different font for your comments.

Good idea...but not quite sure that would work for my company... :) http://astartupaday.wordpress.com/about