Yesterday President Bush 43, President Bush 41, and Jeb Bush (the former governor of Florida) surprised Rush Limbaugh on his radio program to wish him a happy 20th anniversary: "President George W. Bush calling to congratulate you on 20 years of important and excellent broadcasting." Transcript here.
Update: This morning National Review Online published "No Accident: A Brotherly Tribute" by David Limbaugh (Rush's brother).