I haven't found a definitive answer in the SRD for the following questions:
Do medium and heavy armor slow down other forms of movements like burrowing and flying?
Can flying creatures still fly with medium and heavy encumbrance? Count medium and heavy armor as medium resp. heavy encumbrance?
Which skills will receive the non-proficiency penalty? Craft, Disable Device, Forgery, Heal, Open Lock, Perform, Ride, Survival, Use Rope? This list doesn't include skills, which receive always the armor check penalty.
Do medium and heavy armor slow down other forms of movements like burrowing and flying?
Can flying creatures still fly with medium and heavy encumbrance? Count medium and heavy armor as medium resp. heavy encumbrance?
Which skills will receive the non-proficiency penalty? Craft, Disable Device, Forgery, Heal, Open Lock, Perform, Ride, Survival, Use Rope? This list doesn't include skills, which receive always the armor check penalty.