As Dojo suggests on their website, I opted to use Google’s copy of the Dojo Toolkit:
<script src="http://ajax.googleapis.com/ajax/libs/dojo/1.6/dojo/dojo.xd.js" type="text/javascript"></script>
This worked very well until today. After doing some digging, I realized that according to Google’s documentation, the URL has changed:
<script src="http://ajax.googleapis.com/ajax/libs/dojo/1.6.0/dojo/dojo.xd.js" type="text/javascript"></script>
I have to imagine that this will be bad for a lot of websites, but at least the solution is fairly simple.