[Patrick_Devine]

Usually money retreats from the equities markets to the bond markets when bubbles pop. The bond markets are a lot less sexy, but they offer a coupon (tech equities almost never offer a dividend), and the value of the bond will often rise above the face value of the bond when people are scrambling to find a safe place to park their money.

Just look for some bond funds which have had reasonable performance through the last few bubbles if you don't want to invest directly into bonds. You can also do a bond ladder, but some people advise against them.

EDIT: changed "usually" to "often" when describing the value of a bond