WeLcOmE to the forums Duke.
BTW that shoulder is most likely to be "rotator cuff tendinits" - inflammation of the tendons that attach muscles that allow you to (for instance) do an overhead serve in Wii Tennis.
Most easy to spot if, by raising your arm up over your head, pain around the shoulder joint increases.
Just rest it for a night....at most an ice pack
might help a little
....then go back to playing to the Wii again when it's better
