According to a recent report from emarketer reported in Dead 2.0, only 2% of US employees subscribe to RSS feeds. 88% do not even know what it means! Other stats show that only 13% have a good idea of what podcasting is. You can actually see the bell curve of adoption at work, with 12% of people still not knowing what spam is (via Business 2.0).
The RSS numbers also jibe with the numbers mentioned by Martin Nisenholtz from the New York Times in another Business 2.0 article (not online yet). RSS feeds at the NYT only generate 12.2 million pageviews out of a US total of 295 million.