Every Once in a While Google Docs Burps

Being, as I am, a huge advocate of Cloud Computing, I have almost all of my important documents and data stored outside my building somewhere. I'm a big fan of Dropbox.com for keeping documents synched across all my computers (including my iPad) and I have my work teams using GoogleDocs for all of the documents we can possibly use it for.

But every once in a while, the Cloud burps and makes me pause to wonder if trusting it to take good care of my information is really as wise as I often think.

Tonight was a case in point. A colleague emailed me a PDF. I received it as an attachment to my Google Mail email, which offers the option of Viewing the document online via a gDocs viewer. That saves downloading files I don't care to keep. So I click on "View" and I get an error from gDocs saying, "Sorry, we are unable to retrieve the document for viewing at this time" and encouraging me to try later.

Huh? This is a standard format document opening from Google Mail into Google Docs and it has a problem? 

I downloaded the document, read it and trashed it, but still.... This makes me feel uneasy somehow.
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