The RealMoney contributors are in the business of trading and investing all day on the basis of ongoing news flow. Below, we offer the top five ideas that RealMoney contributors posted today and how they played those ideas.

AONE

By Jim Cramer
6:34 a.m. EDT

Lot of silly stuff about how

A123 Systems

(AONE)

was supposed to come at $8-$9 but came at $13 instead because of great demand. They knew this, the underwriters, they could have priced it at $15-$17, but they wanted to get articles written like the one in the

Journal

today about frenzies and IPOs.

Positions: None

Research In Motion

By Timothy Collins

I plan on selling my remaining

Research In Motion

(RIMM)

$85 straddles shortly after the open this morning. I have nibbled on some stock premarket, so I'll be watching the premarket lows closely.

Positions: Long RIMM, RIMM Oct 85 straddles

Pavlov's Sentiment to Dog Market

By Howard Simons
10:26 a.m. EDT

We live in a world of 10-minute oil changes and even faster sentiment shifts. While there always have been those who feel honor-bound to be bearish on down hours and positive on up hours, these folks are easy to spot and ignore.

What we cannot ignore is the training a generation of those who convinced themselves they were long-term buy-and-hold investors have received since 2000. Rude, rude, rude. Those who did not sell during 2000 or 2001 found themselves in pain during 2002. After the 2003-2007 re-bubbling of the market, those who didn't sell early found themselves in deep pain by early 2009.

The Pavlovian training has been to reward those who flee at the first warning signs and to punish the buy-and-hold mentality. That training has been reinforced by a general unease over how much of the past six months has been a reaction to various fiscal and monetary stimulus programs.

If the market sentiment of the late 1940s and late 1970s is a guide, we will be living in such a world for another few years.

Positions: Long growth, value and sentimental value

RIMM

By Robert Marcin
11:02 a.m. EDT

Interesting stock reaction to the

Research In Motion

(RIMM)

news. One must wonder if disppointing results/guidance will be treated so harshly in the upcoming earnings season? Is RIMM a tell? Time will.

SPY Update

By Bob Byrne
12:26 p.m. EDT

For those readers who emailed regarding the emini/SPY: I just covered half of my SPY short here at $104.30 with the remainder stopped above $104.80. If we happen to see 1033ish on the emini, I will bid in the remaining position.

Positions: Short SPY

This article was written by a staff member of RealMoney.com.