Watch the Right Hand Mutes online guitar lesson by Rich Maloof from Guitar 201: Breakthroughs
The right hand can dampen notes as well, and it's a totally different feel. This technique is called palm-muting. You might find it easier at first with a medium- or light-gauge pick. You should be able to make out the notes in the chord, unlike the left-hand technique where it's a complete mute except for the percussive hit. This technique can be used withopen chords, too — so if that F is killing you, try G to D. There are lots of applications for palm mutes. It’s big in metal and rock, but not exclusively.