We’ve written about DAR.fm before, when it launched in alpha a few months ago. The latest startup from Michael Robertson, it let people record more than 1,500 radio shows from 500 stations, time-shifting their listening. Now the service has launched in its version 1.0, with more than 5,000 stations and 16,000 shows now available for recording. “More importantly instead of an alphabetical listing of shows, we cataloged and ranked each show based on actual user activity,” explains Robertson in an email. “Users can browse this database of radio content and every show is rated by its popularity which DAR.fm deduces by measuring the more than 1 million minutes of daily recording users are doing with the system.” The algorithm is based on technology developed for MP3.com back in the day. Robertson has big plans for the service, saying it wants to be “the IMDB + TiVo for radio”.