Watch the Rock Daddy - Rhythm online guitar lesson by Jeff Scheetz from Rock Solid
You can do some pinched harmonics to really get the notes to "squeal" - 80's tribute bands will want to sign you up right away! Try to experiment with different amounts of palm muting with your right hand. This can really help you control things especially at a loud volume.
Listen to different players as they apply their palm muting and see where they use it. This can give you some good ideas on how to use yours.