Read original post by Samidip Basu at Ramblings of a 'Metro' Developer Blog
Grilled turkey burgers for lunch + wife busy with dissertation = Full & ready to crank out some solid code for a few hours. I rub my hands and sit down to knock off a pending project work. At hand, is a Windows 8 Release Preview Metro app that we are building for a client. Traditional technician-out-with-a-tablet setup; so offline access & later data sync with server DB is called for. The immediate answer is OData, as a service on top of backend Database .. seamlessly & asynchronously read/write data through plain HTTP. I have done OData CRUD numerous times in Windows Phone, web or Silverlight .. this should be a piece of cake!