After getting some feedback over the holiday week, we have made a few improvements to the Connect site for Commerce Server 2009 to improve accessibility. If you are already registered and are having difficulty accessing the README and Installation guide, please visit https://connect.microsoft.com/SelfNomination.aspx?ProgramID=2838&pageType=1&SiteID=643. Otherwise, please visit https://connect.microsoft.com/site/sitehome.aspx?SiteID=643 for first time visitors. Hope this helps!