THIS AMERICAN LIFE DOWNLOADS
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NOTE: I'm not hosting these.  This is just a workaround to get them from the streaming servers.
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Launch Firefox, enter about:config in the address bar and press enter.<br />
Right-click anywhere on the page it opens, and select New String<br />
Add "general.useragent.override" as the string name, and "iTunes/4.7 (Macintosh; N; PPC)" as the value.
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Thanks to <a href="http://ldopa.net/2006/06/29/life-lifting/">ldopa.net</a> for that tip.
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Then, use these links to download the eps... You can change the url to this page to change the first and last episodes.<br /><br />
<a href="http://www.dirtygreek.org/stuff/tal.php?min=314&max=321">http://www.dirtygreek.org/stuff/tal.php?min=314&max=321</a>, for instance, will show you eps 314 - 321. 
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If you want to be a real nerd about it (and hey, who doesn't?!), you can download and install <a href="http://curl.haxx.se/">curl</a>.  <br />
Then, you can use <a href="tal.bat">this batch file I wrote</a> to download the files you want.  You'll have to know what you're doing, though.
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UPDATE: I've added a new set of links that I don't think require the firefox trick.  Got them by decompiling the flash player on the TAL site.  
<a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/314.mp3">http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/SHOWNUMBER.mp3</a>
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Just replace SHOWNUMBER with the number. 
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<a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/314.mp3">Episode 314</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/314.mp3">Episode 314</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/315.mp3">Episode 315</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/315.mp3">Episode 315</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/316.mp3">Episode 316</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/316.mp3">Episode 316</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/317.mp3">Episode 317</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/317.mp3">Episode 317</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/318.mp3">Episode 318</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/318.mp3">Episode 318</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/319.mp3">Episode 319</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/319.mp3">Episode 319</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/320.mp3">Episode 320</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/320.mp3">Episode 320</a><br /><br /><a href="http://audio.thisamericanlife.org/jomamashouse/ismymamashouse/321.mp3">Episode 321</a>
			<br />or try
			<br />
			<a href="http://wbez-tal.streamguys.us:8020/content/321.mp3">Episode 321</a><br /><br />