Take a look through the docs, and the examples, to see if this idea is already implemented. Sven's suggestions of FormBinding is demoed here: http://www.sencha.com/examples/explo...l#basicbinding. Note that the source for the example is available in the second tab. The LabelField will work like the other text fields, but will not allow the user to edit the data.
Note also that ExtGWT doesn't use tables by default for most layouts, as there are almost always better/faster ways of drawing content. If you actually want a <table> to wrap your content, not just that basic label: value appearance, you may need to implement some of these details on your own.