Montreal Trudeau Airport Tower, Terminal
Toronto Pearson Tower, Terminal
Quebec City Tower, Ground, Terminal
Winnipeg Tower, Terminal
Waterloo/Kitchener Tower, Ground

Toronto Terminal - West Satelite Sector
Toronto Center
Winnipeg Center West Low/East High

Chicago O'Hare
SoCal Approach

Zurich Radar
Dublin Tower, Ground, Clearance, Terminal
Amsterdam Radar, Terminal

If you are in need of a Real Audio Player, get it here:
Real Audio Download
I suggest the Free Download of RealPlayer 7 Basic, it's all you will need.

Some Live ATC Feeds are provided courtesy of a fantastic websiteliveatc.net