Is there a version of jQuery somewhere that I can hotlink to without hosting the file?

Yes, it's available on Google's CDN.

Everything you need is here: http://code.google.com/apis/libraries/

You can link directly to the javascript file: https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js

or use the google.load method

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Update

Its also available on Microsoft's CDN or the jQuery CDN

You can have google host it in 1 of 2 methods.

Method 1

<script type="text/javascript" 
        src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
  // You may specify partial version numbers, such as "1" or "1.3",
  //  with the same result. Doing so will automatically load the 
  //  latest version matching that partial revision pattern 
  //  (i.e. both 1 and 1.3 would load 1.3.2 today).
  google.load("jquery", "1.3.2");

  google.setOnLoadCallback(function() {
    // Place init code here instead of $(document).ready()
  });
</script>

Method 2 (more common)

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>

I know jquery.com host's the file as well for users, they might have redirected there jquery hosting to use the google version though.

Microsoft is now hosting jQuery as well: http://www.asp.net/ajax/cdn/#4