From MarketWatch.com: The 12 best retirement investing lessons - MarketWatch Eleven:
Because emotional buying and selling decisions can be an investor's worst enemy, I have learned to make the process as mechanical as possible. This means automatic savings and investing when you're accumulating assets. This means automatic withdrawals in retirement, giving you a regular, predictable income. And this means automatic rebalancing regardless of what the market is doing and how you're feeling.
Some good common-sense lessons that are worth reading.