Ibiquity Digital has signed a marketing agreement with Radio Sherpa to promote content available from HD Radio multicasts. Radio Sherpa's online guide for HD Radio (www.radiosherpa.com) is currently available in Boston and New York and will expand nationwide in the coming months.

Radio Sherpa is a real-time electronic program guide (EPG) and search engine for HD Radio broadcasts and Internet radio. The company has its origins in the MIT Media Lab and the original Napster.