The definite guide to climbing technique (from 5 Videos found on YouTube):
How to climb a wall's edge
Human climbers could definitely learn something from this cat:
How to do dynamic moves [UPDATE]
and a double dyno:
How to climb a roof
Well if you don't find Homer Simpson's technique very inspiring, just skip it for the next one; as horizontal roofs are not that common in climbing anyway:
How to climb overhangs
Technical perfection - Watch and learn:
How NOT to do Mantling or mantleshelfing
This cat slightly lacks triceps power and/or mantling technique, although it's still a very brave and successful attempt: