The Motley Fool's CAPS investing service is a great way for investors to work together to beat the market. Among other features, CAPS lets users blog about their picks, investing strategy, market view, favorite rugby team, or whatever floats their boat.

As CAPS blogging catches on, players add interesting content every day. I've dug through the past week's posts to find some of CAPS' best insights. With room for only seven posts here, I can't possibly cover all of the great stuff in the CAPS blogosphere, so when you're done here, I highly recommend checking out some more.

Adding Walter Industries
To threaten me around Christmastime when I was young, my parents would say, "Clean up your act or Santa will leave you a stocking full of coal." Today, I'd probably respond, "Bring it on!" The price for coal, particularly the metallurgical type used in steel making, has been soaring.

In the process, companies like Walter Industries (NYSE: WLT) have been signing contracts to sell their coal at impressively high prices. CAPS All-Star ajm101 thinks investors should consider picking up Walter shares. Check out his blog to get his take.

Brazil -- is it too late? No!
BRIC, BRIC, BRIC, right? Everybody's talking about the BRIC countries. But is it too late to start looking at the stocks in Brazil? TMFSarahGen responds with a resounding "No!" Not only are there major Brazil companies like Petrobras (NYSE: PBR) and Vale that could deliver solid returns, but plenty of small up-and-comers as well. Click over to her blog for more Brazilian goodness.

Return of the REITs
A lot of stocks have been beaten up over the past year, and the real estate investment trusts have taken it worse than many. CAPS blogger jstran, however, thinks it's high time to be looking at the REITs. Specifically, he likes RAIT Financial Trust (NYSE: RAS) and Alesco Financial. Hop to his blog for more color on these REIT picks.

In defense of Exxon
It's hard to be happy about $4 per gallon gas, but should we blame the situation on Exxon? Cdp3416 thinks not. This CAPS All-Star lays out very plainly why Exxon does not deserve to be burned in effigy. Check out his blog for the full story.

Don't buy Dr Pepper Snapple Group -- yet
Cadbury is going back to its candy roots, and to help get its focus back has spun off its beverage division, Dr Pepper Snapple Group (NYSE: DPS). Even though it's the third-largest beverage company behind Coke (NYSE: KO) and Pepsi, investors seem to be lukewarm to the new stock. CAPS All-Star Varchild2008 thinks that Dr Pepper Snapple could be a good buy, but a little patience may be required. Click over to his blog for the lowdown.

One of my favorite plays for $200 oil
With expectations even higher now on how far this oil price spike can go, TMFDeej tells readers why he thinks Penn West Energy Trust (NYSE: PWE) is worth a look. Visit his blog for his full take.

The tide is turning for agriculture and genetically modified foods
CAPS blogger AnomaLee has been reading between the headlines and notes that more genetically modified foods could soon be approved in areas like Japan and the European Union. This could be a dose of good news for companies like Monsanto (NYSE: MON), which supplies farmers with genetically modified seeds. The full story from AnomaLee is just one click away.

And that's our roundup for this week. Be sure to check next week for more great blogging action. In the meantime, why not head to CAPS and add your two cents to the community pool?

More CAPS Foolishness:

Coca-Cola is an Inside Value pick, and Petrobras is an Income Investor recommendation. Walter Industries is a former Motley Fool Hidden Gems recommendation. Try any of our Foolish newsletters today, free for 30 days.

Fool contributor Matt Koppenheffer does not own shares of any companies mentioned. The Fool's disclosure policy thinks stock blogs are all well and good, but it spends most of its time on PerezHilton.com.