I’m not a huge LinkedIn user, but I am impressed that they iteratively work to make their product better and better by targeting better social connection and better user experience.
The other day someone invited me to connect (no, not my wife, like the picture depicts), and I was impressed with both the use of dynamic button names and the behavior of providing help text when I hover over one of the buttons. Notice that the button dynamically includes my wife’s name (click picture to view larger image). Also, note the hover text.
I like this method of providing contextual help, particularly because it explains what the resulting action will be when the user clicks the button.