I did get the plugin working at least as far as I could. Seems their have been some changes to the way pandora works and the plugin won't authenticate your user ID right now. From what I read it is being worked on and we should be good to go soon.
By the way atleast what I did to get the plugin to atleast load and ask for user id and password was update my XBMC build to the latest svn build which at the time of my installing it was Revision: 31085. Now I see now I see it is Revision: 31086.