This is a great site. You can listen to 160m, 80m, 40m and 20 meters live. W4ax is running a WebSDR
server. WebSDR is a Software-Defined Radio receiver connected to the Internet, allowing up to 40 users to listen and tune it simultaneously. SDR technology makes it possible that all listeners tune independently, and thus listen to different signals; this is in contrast to the many classical receivers that are already available via the internet.