The stock market is still unstable and will be likely to go lower, much lower, before it goes back to levels we've seen in recent years. My advice would be to diversify the money you have by putting it into a variety of investments. CDs can be part of your portfolio. Also consider mutual funds managed by strong established investment firms. After you get a "nest egg" built up and get a little comfortable with the stock market, look at individual stocks in solid companies. Stocks that pay dividends are always nice to hold. With CDs your base investment is relatively secure and you'll end up with more that you started with. Shop around in local banks and on-line for highest rates. With the stock market, don't invest money that you're not willing to lose.
If you start with mutual funds, don't plunk all your money in at once to buy shares. Dollar cost average by investing an amount every month - sometimes you'll buy cheap and sometimes high, but in the long run, you'll be ahead of the game as opposed to investing a large sum all at once.
Pick up a copy of Money magazine and start to plan and learn about investing. There are tons of good books for beginning investors. Don't forget to work on a college fund if you plan on having kids.
I bought my Z in 1971 and started investing in the market in 1972. As they say, "Life is a journey, enjoy the ride".
Dennis