Most routers can be hacked with custom, open-source linux OS, meaning you can also hack your old routers to become other useful gadgets like a WiFi internet radio.
Here’s a great tutorial that shows us how to make a WiFi internet radio using an Asus WL-520GU router and a USB sound card.

Other interesting stuff at Zedomax.com: diy internet radio, how-to, internet radio hack, make, wifi radio
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