GIS Development for Desktop, tablets and Mobile devices

[LakshmananVenkatesan]

We have  requirement to develop a RUI web application [simple - non editing - with reports and printing] which should be accessible in desktop , tablets and mobile devices. Application should be rich user interface and attracts customers and works in all browsers.
I need to which ESRI API suits for this ?. We are ESRI shop and data reside in Oracle 10g - ArcSDE. Can any one point me right direction on correct technology stack and architecture.

[JohnGravois]

well... since access to Silverlight or Flex is problematic on many mobile devices, you're definitely in the right place.

Our JavaScript API is built to speak with ArcGIS Server so you should be able to publish services with SDE data stored in Oracle and go from there.