Hammer-on exercise (could be used for muscle memory exercise)
http://www.guitartricks.com/tutorial.php?input=338
Also good would be scale exercises
http://www.guitartricks.com/lesson.php?input=8213&s_id=75
http://www.guitartricks.com/lesson.php?input=9535&s_id=185
http://www.guitartricks.com/lesson.php?input=3582&s_id=38
Metal Rhythm tutorials
http://www.guitartricks.com/tutorial.php?input=231
http://www.guitartricks.com/tutorial.php?input=264
http://www.guitartricks.com/tutorial.php?input=319
http://www.guitartricks.com/tutorial.php?input=360
Right hand strumming exercises (that should help for working on relaxing the right hand)
http://www.guitartricks.com/tutorial.php?input=275
Streching exercise
http://www.guitartricks.com/lesson.php?input=8720
