Autodesk helps you – help yourself…
From the site:
What is Autodesk® Seek?
It is a web service that allows designers – architects, engineers, students – to search and find generic or manufacturer-specific building products or components and associated design content. This content could include 3D models, 2D drawings, specifications, and descriptions for that product or component.
Which industries are you targeting with Autodesk® Seek?
Currently, it is targeted at designers working in the AEC (Architecture, Engineering, and Construction) industry. We are considering extending the service to include content particularly useful for mechanical designers in the future.
What are the system requirements for Autodesk® Seek?
This is a web service, so all you need is an internet connection and a web browser. The browsers that are recommended are Firefox 2.0 and Internet Explorer 7.
How do I download files from Autodesk® Seek to use with my design applications?
What types of files are available from Autodesk® Seek?
We have adopted an open approach in order to provide you with the design file or product specification that you need regardless of its format. This service is not restricted to only providing you files that are of an Autodesk format. You will find everything from Revit product family files and DWG files to DGN and SKP files to Microsoft Word documents and PDFs.
Go to Autodesk Seek 
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