Are there any issues regarding IIS that result from changing the computer name on the IIS 7 server?
IIS7 (Windows 2008) Does not have the same user ID problem as IIS6 (Windows 2003). You can safely rename your web server.
I searched for a while and found the following helpful
http://www.eggheadcafe.com/software/aspnet/31184520/cannot-access-iis-web-server-after-computer-name-change.aspx
http://support.microsoft.com/kb/234142