Well, I spent a while studying finance, so I kind of enjoy following the stock market. The interaction of individuals in the pursuit of profit is like no other. And you get to make money too! The most practical links to get you started are:

Bloomberg - a US resource with international coverage.

CNN - US futures and a range of other US and international information.

ComSec - An Australian online broker with quotes, charting and watchlist. 

Investorweb - an Australian website providing financial information, news, research, forums and quotes.

I also enjoy technical analysis, which is the study of human behaviour and the interaction of buyers and sellers in the marketplace. It is based upon the analysis of stock charts.

I have also completed the Technical Analysis unit conducted by the Securities Institute of Australia. 

If you are interested in technical analysis and would like a A-Z summary check here.

Otherwise, my favourite links below:

MarketMad - a good resource for technical traders.

Stockcharts - a US site with technical information on US indices.

The ATAA - a member site for those wishing to join the Australian Technical Analysts Association.

Sometime this year I want to take up trading options and futures again. I have done it before and while its a little scary, the thrill and the opportunity to make cash exists. Especially now, while the world is in such a mess and markets are very volatile.