Yes. You can redistribute Autodesk Design Review 2008 to anyone without prior approval from Autodesk, subject to the terms of the license agreement.
If you examine your license agreement (license.rtf file gets installed) for Autodesk Design Review 2008, you will find:
"The Software is licensed to You as a single product, and its components may not be separated for distribution or use. You may copy and distribute the Software and User Documentation only in its entirety, and you will not redistribute: (i) Software (whether it is integrated with other technology as a component or as a standalone product) that does not provide end users access to the complete Software Install process, including this Agreement; or (ii) incomplete, modified, reverse engineered, or otherwise altered copies of the Software or User Documentation."
Based on the license agreement, a common strategy is for application developers to include SetupDesignReview.exe with their applications and have their users run it as a prerequisite to installing their applications. The MSI file is also available. The ability to include the free Autodesk Design Review 2008 with applications will add value to the DWF experience and helps DWF go Beyond the Paper.
Please feel free to contact us should you have any additional questions. Thank you.