Google Reader Shared Comments
When you share an item in Google Reader, it appears in your Shared Items list (open Your Stuff in the left hand column to see your Shared items).
When you share an item with a note, the icon changes to your profile picture. This isn't exactly intuitive, but it is at least consistent.
If you add a comment to a shared item, the icon changes again to include a little comment bubble. I had not noticed that before.
