Re: Cloud, REST, HTTP, PHP, trendy NoSQL DB de-jour, blah blah, whatever...
"Tying yourself down to a legacy technology stack like that doesn't make much sense."
Neither Oracle nor SQL is legacy despite what the NoSQL vendors may have you believe. Having used Mongo in anger I can assure you I'd far sooner use a relational DB for almost all business operations except for simple document storage and lookup as it sucks at just about everything else.