Great thread. I only listen in the car, but I listen to something most of you have not heard of. HD radio. It's broadcast on standard AM and FM frequencies on a sub-carrier of each analog station that has chosen to go to the next (hopefully)standard. It is a digital signal, and gives CD quality sound, and on FM, has the ability to have up to 5 different "channels". Most people aren't aware of frequency range, and how it is "chopped" on the high end of FM stations at 12,000 hz, while the human ear hears almost to 20,000 hz(at least younger folk hear that high). Analog stations compensate this chop by boosting it before the chop occurs, creating noise. You wouldn't necessarily notice this until it is compared to a digital signal. An HD radio first tunes the analog signal, then in 3 to 5 seconds, it acquires the digital signal. A very noticeable difference. Almost half of the stations here in the Washington D.C. area have gone HD.
More info at hdradio.com