We noticed that Salesforce instance is not available and when log in it's asking to check the availability at http://trust.salesforce.com/trust/status/. This is the first time I had this experience which salesforce did this without sending any early warning mails. After having a look at the given link I noticed that several instances are facing the same or similar situations. Those are because of Performance Degradation, Service disruption, etc.
Has anyone experienced this before? I'm confusing about the reliability of Salesforce, because I believe customer is the king concept :)