Gartner's Don Feinberg on Database as a Service and Cloud DBs

IntelligentEnterprise : Q&A With Gartner’s Don Feinberg on Database as a Service and Cloud DBs (printable version):

Microsoft, IBM, Oracle and Sun are now fueling the growing fire around the database-as-a-service and cloud database markets, but what’s the difference between these offerings and what’s the appeal? Database guru Don Feinberg defines terms and raises important questions about reliability and security.