Today I discovered that JFace provides a nice default implementation for the IStructuredContentProvider - the org.eclipse.jface.viewers.ArrayContentProvider class. Most of the time, the input to a ListViewer will be either an array of objects or List of objects. This content provider handles both cases. In fact it handles Collection - so you can even pass a Set or Queue to the viewer.setInput() method.
This might be the shortest tip I've ever written. Couldn't resist myself from blogging this. Hope its useful :-)
Update [6-Oct-2008]:
ArrayContentProvider is now a singleton! Which means, less memory consumed even if you use this for multiple viewers
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