in IIS7 Add a binding and give it the *.example.com (wildcard cert), then, go to a command prompt and type the following:
C:\Windows\System32\inetsrv>appcmd set site /site.name:”sitename” /bindings.[protocol=’https’,bindingInformation=’*:443:’].bindingInformation:*:443:hostname.example.com
it will bind your SSL site to the hostname you selected!
http://technet.microsoft.com/en-us/library/cc753195%28WS.10%29.aspx