Argh, a long post just got erased by my foolishness. Let me see if I can re-create it.
Even with interest rates going up in the US for the first time in a long time, I think there is still a bit of room for growth in the US market. I think part of it is that the market has the entire built-up mortgage industry propping it up, which is really something new in the history of the housing markets facing a collapse. I think they will provide a few extra months of support before things tail off.
I think the biggest area of concern is California. They are always on the leading edge of the US housing market, both boom and collapse. Currently California real estate is out-of-control, but I still think there is a little play left there before things fall apart.
The good news is if you are looking at housing outside of California and the upper-crust North East that you are going to have time to get out before things fall apart. Watch California and when the bottom drops you will still have time to make a move elsewhere. if I were heavily vested in California housing right now, I would seriously be considering moving to something else.
I think 3-6 months is still a good window before things really go down.