This excerpt taken from the SIRI DEF 14A filed Nov 4, 2008.
Why did I receive a one-page notice in the mail regarding the Internet availability of proxy materials this year instead of a full set of proxy materials?
Pursuant to the new rules recently adopted by the Securities and Exchange Commission, we have elected to provide certain stockholders access to our proxy materials over the Internet. We believe that this new e-proxy process will expedite our stockholders receipt of proxy materials and lower the costs, and reduce the
environmental impact, of our annual meeting. Accordingly, we sent a Notice of Internet Availability of Proxy Materials (the Notice) on or about November 4, 2008 to certain stockholders of record entitled to vote at the annual meeting. All stockholders will have the ability to access the proxy materials on a website referred to in the Notice and to download printable versions of the proxy materials or to request and receive a printed set of the proxy materials from us. Instructions on how to access the proxy materials over the Internet or to request a printed copy from us may be found on the Notice.