wow, 18 million blogs and the Nielsen folks poll 1,000 people. I won't quibble with the basic thesis of the results, but I also won't attach much weight to it either given that RSS is still building the early adopter base.
Nielsen/NetRatings polled 1,000 members of its research panel who read blogs. It found that nearly two-thirds of the respondents either never heard of RSS (Really Simple Syndication) or did not know what the technology is used for. The study found only 11% of Web log readers use RSS to monitor blogs.