I used to have a list of links for Live ATC (time delayed actually by 5 minutes) and loved to sit and listen, but recently noticed many no longer work, probably due to Homeland Security :-/
Although there is one that at the right time is interesting it is of a local airport in Australia where a lot of flight training takes place. Let me see if I can find the link.
Looks like a lot of the links that Ender posted are dead too

Hi Jeff...!
The ATC link I posted above seems to work O.K....

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I just have to remember the different time zones...

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When I try it here in England at breakfast time, ATC at KSFO, (San Francisco), are probably still asleep at their desks...(6 hours behind)...

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So it's often pretty quiet...

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LOL...!
Wouldn't it be nice if the real ATC broadcasts were as slow, clear, and precise as they are in the flight sim...

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Just completed a trip from KSFO to Lost Isle, via Concord Buchanan in the flight sim, (FS 2002), Cessna 182RG...fantastic, clear, ATC conversations...

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Cheers all...!
Paul.