According to new forecasts from The Diffusion Group, demand for podcasts is expected to grow from less than 15% of portable digital music player owners in 2004 to 75% by 2010. The new report, “Podcasting: Fact, Fiction and Opportunity,” suggests that “between 2004 and 2010, the use of podcasting among US consumers will enjoy a compound annual growth rate (CAGR) of 101%.”