As someone else said, there is a long thread on the Permanent Portfolio concept on the other board:
http://www.diehards.org/forum/viewtopic.php?t=15434&mrr=1208373111
The Permanent Portfolio Fund and the Permanent Portfolio Strategy have diverged over the years a bit. The fund is a more complicated allocation than the strategy advocated by Harry Browne in his later books. The Permanent Portfolio strategy is basically this:
25% - S&P 500 Index fund
25% - Long Term US Treasury Bonds (20+ years)
25% - Treasury Money Market Fund
25% - Gold
You hold in this portfolio money you can't afford to lose. If you feel like speculating you do it with a Variable Portfolio (this is optional). The only rule is you can't use money from the Permanent Portfolio to re-fund your Variable portfolio if it lags the market or you lose it all. The portfolio is re-balanced whenever an asset is 15% or less or 35% or more (sell or buy to bring it back up to 25%).
The portfolio is designed to do well across the four basic economic conditions of prosperity, inflation, recession and depression. It has low volatility and respectable returns in the 9-10% range over the past few decades given the low level of risk.
I believe that Harry Browne's 16 Golden Rules of Financial Safety are worth reading and following. They contain a lot of very good wisdom:
http://harrybrowne.org/articles/InvestmentRules.htm