The AGCC countries have said that they will not de-peg until at least 2010. The World economy is not on stable ground at the moment and the Sub-Prime fallout in the US has only just begun to impact on the wider economy. No happy horizon for the US dollar and don't forget to factor in that oil is traded in US dollars.
Anything can happen and my money will be in that tin on Fox's fridge on my next trip, but don't expect a de-peg before 2010.
Remember the Decore ad... it won't happen overnight... but it will happen.