In my clock on my homepage and my hobby site www.unitingrhythms.com the numbers for the clock face are applied with CSS rotate, but Opera shows the number 6 the right way up (it should be upside down) and in the wrong place.
Also remember to use the non-prefixed version as last in sequence otherwise you run the risk of using only prefixed versions which may get dropped as time goes by (unlikely as it may seem but with the recent vendor fiasco anything is possible.).