Rated 4 out of 5 stars
Brilliant idea. I'd like three things:
1) the ability to choose which icons are displayed in the short/unexpanded view
2) the ability to customize the actual word associated with each icon. so instead of "person," that icon could be "blog" -- no use tagging if it doesn't fit the tagging scheme I've already been using.
3) simpler icons. On a large display, the more complex icons are too tiny to make out.
Overall, though, a really great, intuitive idea that has the potential of becoming a "must-have" extension.