"Digital audio formats--from satellite radio to podcasting--are catching the ear of U.S. consumers. By 2010, more than 20.1 million households will be hooked to satellite radio, up from 4.5 million subscribers at the end of 2004, market research firm Forrester predicted in a report released on Monday. Also by that time, nearly 12.3 million households will use MP3 players to listen to podcasts, it forecasted. Streaming audio is expected to grow significantly as players like America Online and Yahoo, along with traditional broadcasters, shift or step up their online programming, the research firm said. By the end of the decade, online radio will reach 30 percent of all U.S. households and about half of homes that have broadband connections."No surprises here - digital audio is gaining ground, though the tools for sharing digital media throughout your house are still a little on the rough side to use. Things need to, and will, get easier.