When exploring data using the explorer view in the workbench, a checkbox 'Show data types & language tags' is shown. This checkbox should influence how literals are rendered in the explorer. Unfortunately, it currently seems to have no effect: typed literals are shown without their datatype, whether the box is checked or not.
Firefox 21.0 Mac OS X 10.8.3 (x86_64)
Google Chrome 26.0 Mac OS X 10.8.3 (x86_64)