I ran across this nice feedback module while exploring Daily Challenge; a social networking site that promotes good deeds.  A simple feedback button remains static on the left hand side of the site and opens the above screen in a lightbox when clicked.

The module allows a user to either share an idea, ask a question, report a problem, or give praise all through a simple and intutive form.  The icons in the navigation make it easy to identify the separate actions that can be taken.  When one is selected, the tab is highlighted and the instruction within the comment field changes to reflect the choice.  The menu on the right offers up recent and relevant information related to the selected action.

A very nicely done piece.  Just one of many on this site.