CDN: Content Distribution Network
PPLive, Amazon Cloudfrout, NetDNA
http://www.shoutcast.com/BroadcastNow
http://www.instructables.com/id/How-to-Make-a-19-Police-Radio-Scanner/
The only hardware required besides a computer is going to be a SDR receiver. The bulk of these radios are just USB TV tuners, rebranded and sold as SDR receivers. Many are available on Amazon and eBay. A quick google search should turn up some more as well. I recommend purchasing from somebody who knows about SDR, a popular dealer is NooElec.com. (NooElec also has stores on eBay and Amazon)
In this guide I will be using a Newsky TV28T v2 with a RTL2832U & R820T tuner
http://www.nooelec.com/store/sdr/nesdr-mini-rtl2832-r820t.html
Rikomagic controller
http://www.rikomagic.com/en/product/showpro_id_71_pid_25.html
FUNcube software-defined radio (SDR).
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Zoom R16
https://www.zoom.co.jp/products/multi-track-recorder/zoom-r16-recorder-interface-controller
Bearcat Scanners
BCT15X
SDR (Software Defined Radio)
Supported Radios
http://www.sdr-radio.com/Radios
RFSPACE, FUNcube Dongles, Soundcard (SoftRock) and low-end SDRs