Quote from AAAintheBeltway:
The traditional rules of portfolio managment apply. Diversification is a must. Buy and hold can leave you feeling pain, and of course, falling in love with a position is very risky. While a hard dollar stop should always be used, a time stop is also a good idea.
Some of the more attractive issues have a nasty tendency to spring preannouncements on you without much warning, leaving your portfolio and possibly you unbalanced. Stay away from issues looking to enhance value by merger and acquisitions acitivity.