What do you think of the companies on the Global 500 list this year? Have you worked for any of these companies, or bought their products or services? Tell us what you think. The best replies will be published here, and possibly in a future story on CNNMoney.com.

Fortune senior writer Jon Birger argues that commodities traders aren’t the reason why oil prices are at record levels — and that anyone who thinks they are doesn’t understand how futures markets work. What do you think? Is Birger right?

The world’s best investor is betting big that the return of an S&P 500 index fund will beat the return of a collection of hedge funds over 10 years. Will Buffett win this gamble?

Fortune’s Shawn Tully makes the case for why, much like the housing market, the boom in oil prices will turn into a bust — we just don’t know when that will happen. Do you agree that oil prices will plunge, or do you think the prices we’re seeing today are here to stay (or could go even higher)? Tell us what you think.

Fortune’s Richard Siklos writes about the problems that Apple and other electronics makers are encountering as they try to bring the Internet and TV together in your living room. What do you think is the future of entertainment in your home? Is it Apple TV, or some other dream device that hasn’t yet been invented? Tell us what you think. 

Business travelers are usually pretty opinionated about the places they have to stay - if the food is exceptional and the staff is attentive they’ll notice. Likewise, if the shower pressure stinks or the shoe shines are sub par, this constituency is sure to complain.

So if you’ve had the pleasure of staying at any of these hotels, we want to hear from you. Are they even better than our scouts said, or did they fall short of expectations? Post a comment below and tell us what you think.

In this Fortune feature, 25 accomplished people - from drummers to astronauts to CEOS - talk about the advice that most influenced their lives. What was the best advice you ever got? What was the worst?

Fortune’s David Kirpatrick wrote the following after the annual World Economic Forum meeting in Davos. What’s your view?  

By the final day of this year’s World Economic Forum, people were joking that the world had gone through a full economic cycle in the four days the conference had been underway. After a Monday on which global markets seemed in freefall, by Friday the Dow average amazingly showed a tiny gain for the week. Klaus Schwab, the paternalistic overseer of each year’s Forum, was proudly talking of a “Davos effect” on world markets.

That was probably wishful thinking, but it was easy to fantasize that this group could engineer such a transformation. (And it was true that the general Davos mood on the global economy was not as grim as the press would have had you believe.) Here gathered the - mostly Western and developed - world’s bankers, pundits, government officials, corporate executives, and perhaps most importantly, investors.

At one lunch I happened to find myself sitting next to a guy who runs a $30 billion New York hedge fund. At a dinner I spoke to the CFO of Mubadala, the government-controlled Abu Dhabi investment group that owns 7.5% of the Carlyle Group, 8% of AMD, 5% of Ferrari, etc. etc. etc. George Soros roamed the halls, J.P. Morgan Chase’s Jamie Dimon sipped water in the lounge, and the Google guys stood on the stairs with their wives.

Five years ago White House economist Lawrence Lindsey ignited a furor with this estimate of the dollar cost of the Iraq war. In this exclusive book excerpt, he tells how he came up with the number and what he thinks now.

We think you’ll find his case for the war’s affordability to be a provocative one. What do you think?

New research suggests that, contrary to popular perception, we’re actually working less than we used to. If so, what does that mean for our country? Instead of 9 a.m. to 5 p.m., should we all be working 8 to 6?