I hear lots of Public Radio on SIRIUS during the day and always comment when there is a story that I can use to insert a plug for the FT. Follow this discussion for email updates to stories you can join me in commenting on. I'll post the relevant information and links as new stories pop up. Thanks.
EDIT: If you submit an especially interesting comment they may want you to read it for them for transmission on-air. We reach even more people that way.
(BTW, if you have any alerts to different programs put them up here. I'll join you.!)