John Dvorak, who wrote for MarketWatch on Thursday, invoked the age old investoris maxim: sell on good news and buy on the bad. In this case, since no company can have as much good news as Apple, he advised to sell short.

Mr. Dvorakis reasoning went as follows:

• Sell when other people are buying.
• A report of iPhone keyboard problems from an undisclosed source. Mr. Dvorak, however, is "not convinced."
• Apple bought into the gropupthink that people want to surf the Web on a handheld device, and he doubts that premise.
• The functionality of the iPhone will be duplicated by competitors, and Apple "will be trading water."

Hedging even his own advice, Mr. Dvorak advised that selling short can wait. Perhaps until the device actually ships. Even so, he said the time will come.

Recently, Bloomberg News polled Apple analysts regarding Apple stock.. Twenty-three of them said "buy" while only four said "hold." None were advising "sell."

Stocks can be risky, and no one knows what tomorrowis headlines will bring. However, right now, Mr. Dvorak seems to be a lone voice.

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