@Paige Kelsey do you have a link to the article so I can give it a read?
I don't know about Portland, but I would agree with the rest of the Denver folks that I don't believe the Denver market will crash but it will likely soften somewhat over the next two years.
I thought @Linda Weygant's response was a great one for buy & hold investors - as long as you aren't leveraged to the max and would struggle to make payments if rents took a dip, as a buy & hold investor you should be fine - history shows that housing prices will increase again eventually.
And while I don't have data to back this up (maybe someone else does?), rents don't usually see the same magnitude of swings as real estate prices so as long as you are buying property that cash flows today and don't have a massive portfolio of properties you should be ok even if there is a contraction as long as you have another source of income and aren't forced to sell.
Personally I hope the Denver market does take a tumble so I can start buying properties at a discount and ride the eventual wave of improvement to a nice financial windfall.