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Let me tell you one thing, an outage in CDN is very rare. But just in case you don’t want to take a risk, go ahead with this fallback mechanism, as suggested by Scott Guru.
Microsoft CDN outage for jQuery:
<script type=”text/javascript” src=”http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.min.js”></script><script type=”text/javascript”>if (typeof jQuery == ‘undefined’){document.write(unescape(“%3Cscript src=’/Scripts/jquery-1.4.2.min.js’ type=’text/javascript’%3E%3C/script%3E”));}</script>
Microsoft CDN outage for AJAX:
<script src=”http://ajax.microsoft.com/ajax/3.5/MicrosoftAjax.js” type=”text/javascript”></script><script src=”http://ajax.microsoft.com/ajax/mvc/1.0/MicrosoftMvcAjax.js” type=”text/javascript”></script><script type=”text/javascript”>if (typeof Sys == ‘undefined’){document.write(unescape(“%3Cscript src=’/Scripts/MicrosoftAjax.js’ type=’text/javascript’%3E%3C/script%3E”));document.write(unescape(“%3Cscript src=’/Scripts/MicrosoftMvcAjax.js’ type=’text/javascript’%3E%3C/script%3E”));}</script>
Use it for any CDN’s.
Let your mind be at peace.. 🙂
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The Relentless FrontEnd - Aackose Lal's Blog 
Apparently this is what the esteemed Willis was talkin’ ’bout.
I read this piece of writing completely about the difference of most recent and
preceding technologies, it’s awesome article.
Apple now has Rhapsody as an app, which is a great start, but it is currently hpmreaed by the inability to store locally on your iPod, and has a dismal 64kbps bit rate. If this changes, then it will somewhat negate this advantage for the Zune, but the 10 songs per month will still be a big plus in Zune Pass’ favor.