With the major search players finally getting into feed and blog search in a big way, a new study from Yahoo and Ipsos suggests that the majority of users still aren't even aware of the technology, let alone using it. People who are using RSS tend to be younger, savvier internet users who use it to track news, entertainment and other sources of information, rather than blogs. More on the survey and its results in today's SearchDay article, Study: RSS Still Not Widely Adopted.
Postscript: See also
More Use RSS Than Have Heard Of It at ClickZ for some nice charts, in particular the RSS products most used by RSS savvy readers.