Ron Reagan (yes, the former President's son - who now has a syndicated radio talk show) has a couple of phone numbers set up for listeners to call in and offer "apologies" to Lush Rimbo ... er, Rush Limbaugh.

One is an on-air phone number - (212) 871-8270 - just for during the broadcasts. The other is an any time voice message recorder.   (I can't find that phone number at the moment, but you can post your apologies HERE.
So if you want to offer Rush an apology, for whatever reason, you can do it there.