Wow, good for you! How do you do it? Are there certain indicators or charts that you watch? (Sorry if this is a dumb question!)
And I though we were doing well by only going down 20% in 2008!
As far as charts, I mostly watch sector performance, bonds, and use good common sense, and draw from experience. Get a CFP to use to bounce or vet any large moves. I also hate to sound simplistic, but whoever first stated "buy low- sell high" conquered 90% of the puzzle. Do good research, and only buy into investments that you feel have potential for sustained growth, or can deliver div's on a sound and consistent basis.
Expat has some excellent links on these.