There is something to said about the buy and hold strategy also. Real life example – in April 2004 a family member bought an equal value of shares of AT&T (T), JP Morgan (JPM), SBC Communications (SBC), and Altria (MO). Their inspiration for these choices was that these stock were on the so-called "Dogs of the Dow" list for that year. Not what I would consider a thoroughly researched purchase. Since then AT&T bought out SBC, and Kraft (KFT) was spun off from Altria. As of 22 Jan 08, this collection of stock (T, JPM, MO, KFT) is up 33.5% overall, despite taking a 9.9% loss from 31 Dec 07 price levels. It has improved slightly since 22 Jan 08.
I am aware that people like Mr. Market Ticker, whom I respect, are saying to get out of equities while the getting is good. Right now I am conflicted as to whether I should advise to ride this thing out or to get out and avoid this crazy volatility.