OpenERP - The throbber’s text update every few seconds when installing an application so you know it’s not frozen.
Google Maps iOS - Shaking the device allows the user to submit feedback.
Balsamiq - The balsamiq help menu helps you decide what to make for dinner.
Kickstarter - After filling out a survey (for selecting pledge awards, providing address, etc.), the site gives you 10 minutes to edit your responses. This works even if you exit the site and return.
/via Paul Robertson
GetSatisfaction - Gives instant feedback when using too many capitals in your title.
Google+ - Sending feedback in Google+ gives you the option to highlight the problem and blackout personal stuff.
/via Robert Winters