This week in Intelligent Enterprise, there is an article by Donald Feinberg of Gartner that talks about Database as a Service (DBaaS) vs Could Databases (Cloud DB).  http://www.intelligententerprise.com/channels/information_management/showArticle.jhtml?articleID=208200257&cid=RSSfeed_IE_News  Definitely worth a quick read.  DBaaS and Cloud DB are very similar except that for DBaaS you know where the database sits and for a Cloud DB you don’t know where the database sits.  For a developer, a Cloud DB can be very powerful because you quickly have access to a database system without having to worry about licensing and configuring.