One Year Later: Lessons we (should have) learned from the crash

Toddlers learn to steer clear of a hot stove after they get burned once, maybe twice. Investors, however, can be a little slower on the uptake.

This time last year, banks that were long thought to be "too big to fail" collapsed, investments that were considered safe imploded and retirement accounts got chopped in half. With such harsh lessons learned, some investors remain justifiably chastened. But now with the Dow inching back towards 10,000, it appears others have all-too-soon forgotten the events of last year.

Here are some of the lessons investors should have learned from the crash: