How do you guage when a market is too risky to invest in?

[Gary Dezoysa]

I'm not that interested in marketing timing other than getting a sense of when risk is relatively high (due to very high prices). I look at the case shiller index to get a sense of this: http://us.spindices.com/index-family/real-estate/s...

Are there any other things you guys do to avoid risky investing periods?