The Motley Fool has some great advice for ETF (exchange traded fund) investors in 2007. Here are three simple and humorous ideas by Bill Barker:

• Buy What You Know This, the second most famous investment advice came from Peter Lynch’s One Up on Wall Street. The advice has one dimension and probably goes by favorite brand or company instead of business model, cash flow statement or balance sheet.
• Buy Low, Sell High This is the most famous investment advice, and highlights the importance of letting profits run and cutting losses short.
• Buy An Index Fund This is the most true investment advice, ever. It is mathematically supported, actionable and to-the-point for any investor. Also mention low cost, no load, low turnover and broad index and the advice still remains true. Since ETFs are index funds, we have more opportunities than ever today.