I just use the same as most and that is the trend is your friend.
A lot of stocks get incredibly hyped and overbought in the latest and greatest fad - dot coms - bio techs - uranium and the same will eventually happen with gold - iron ore and coal.
Uran is a classic example of a stock that was good to ride but you be quick to jump when the upward trend is broken.
Picking bottoms is a fools game as i believe 8 out of 10 times you'll be catching a falling knife and believe me when i say it hurts.
Hope this helps as i'm not a professional and i'm more into property these days.
Cheers
URA Price at posting:
3.2¢ Sentiment: Sell Disclosure: Not Held