The market as a whole is a good indicator of whether it is a good time to buy or sell since most stocks follow the trend of the market. The same is true with sectors. I've been looking for a website that had a nice, easy-to-read list of sector charts but I haven't really been able to find what I was looking for. So I created my own - I think it will help me a lot.
After looking at this, the following sectors look good to buy:
Air Freight, Consumer Electronics, Distillers & Brewers, Food Products, Industrial Transportation, Internet Services, Land Transportation Equipment, Lodging, Marine Transport, Medical Products, Mining, Oil Companies Major, Oil Companies Secondary, Transportation Services, Trucking

You can also look for good sectors to short based on their chart breaking down. Like Softdrinks.

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