I have been able to use Xcode4 with RS 2011r4. I agree that the template does not work. What I did was to download a starter project file from the Monkeybread site to get started. They also have some getting started videos there as well. The link is http://www.mbsplugins.com/CreatePluginMac.shtml
. You will need to refresh the "includes" and "glue code" folders with files from RS 2011r4 in the /Extras/Plugins SDK folder to get the latest plugin development files. If you are unable to get it working, I could email you a zipped test plugin.