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PDE API Tools has the ability to do usage scans given a set of bundles. http://eclipsesource.com/blogs/2009/06/18/api-usage-scan-against-galileo/
I have uploaded an API usage report of 3.4.0.I20100521-1600-e3x against Eclipse 3.6M7 to http://mylyn.eclipse.org/3.4/api-report/html/index.html .