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It seems most everyone does asynchronous requests with XMLHttpRequest but obviously the fact that there is the ability to do synchronous requests indicates there might be a valid reason to do so. So what might that valid reason be?
I think they might become more popular as HTML 5 standards progress. If a web application is given access to web workers, I could foresee developers using a dedicated web worker to make synchronous requests for, as Jonathan said, to ensure one request happens before another. With the current situation of one thread, it is a less than ideal design as it blocks until the request is complete.