This excerpt taken from the EQR DEF 14A filed Apr 16, 2009.
Why did I receive a notice in the mail regarding Internet availability of proxy materials instead of a full set of proxy materials?
Pursuant to the SECs notice and access rules adopted in 2007, we have elected to provide access to our proxy materials over the Internet. Accordingly, on or about April 16, 2009, we began mailing to all shareholders of record at the close of business on March 31, 2009, a Notice of Internet Availability of Proxy Materials (the Notice). All shareholders will have the ability to access the proxy materials on the website referred to in the Notice or request a printed set of the proxy materials. Instructions on how to access the proxy materials over the Internet or to request printed copies are included in the Notice. In addition, shareholders may request to receive proxy materials in printed form by mail or electronically by email on an ongoing basis.