Docs has been down twice in the last two weeks during business hours. 9/7 it was down for about an hour, and 8/26 the Docs listing was down for about two hours (the listed time on the 26th is about an hour after we submitted the issue).
Google docs might have not gone down for everyone, but when we used it, twice we had instances where entire documents got nuked. Eventually two week old backups were restored, which was essentially useless for the type of documents they both were.