It amazes me how the general public continues to do the same thing over and over again....buy at tops and sell at lows.
Our economy, actually the global economy, sucks right now and looks to remain weak through much of 2009. There is not going to be a quick recovery to the all time highs on the markets but over years, probably many years, we will get there. We will see the Dow at 15k again.
All that being said, now is when you need to be putting as much as you responsibly can into investments......not at once though, you should be averaging in as the markets continue to swing up and down dramatically.
If you don't know a lot about stocks and don't want to research individual plays or go the mutual fund route, buy sector or index specific ETFs. There are ETF's for just about every industry or global market you can think of. Here are a few of the ETF's I trade a lot, SPY, UYG, QLD, UYM, DIA, SMH.
Also, investing doesn't have to be an "all or nothing" situation. If you want to get involved but only want to risk losing a certain amount of money, use stops. You should never be investing in anything without identifying your exit conditions ahead of time.