From Greg Sargent at the Washington Post:

Think Progress gets its hands on an internal memo from Premiere Radio Networks that lists nearly 100 national companies that have asked that their advertisements not be played on the Rush Limbaugh show — companies that have not been publicly named until now. Think Progress claims that brings the total of sponsors who have pulled out in the wake of the “slut” controversy to 141 — far more than previously thought.

I’ve confirmed the authenticity of the memo with a spokesperson for Premiere, home to Rush’s show. It’s unclear for now what exactly it means.