The Motley Fool's CAPS investing service is another 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 else floats their boat.

As CAPS blogging catches on, players add more great content on a daily basis. 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.

Poor Starbucks
AnomaLee wasn't caught off guard by the disappointing results from Starbucks (Nasdaq: SBUX). In fact, this CAPS All-Star thinks the pressure on the consumer means that things will only get worse for the coffee peddler.

Time to short Amazon?
With 934 underperform ratings, there's no shortage of CAPS players who think that shares of online giant Amazon.com (Nasdaq: AMZN) will come down. Most players are primarily concerned with the stock's lofty valuation. However, on his CAPS blog, TMFDeej wonders out loud whether government actions on sales taxes could hurt Amazon's business.

The SEC takes pause
Everybody wants their 15 minutes of fame, but who wants to get it by telling their story on American Greed? Hucksters are lurking out there, and that means we all need to be on the lookout. On his blog, Gtrinvestor links to an SEC website that lists shady companies with tricky names. My favorite? Ferguson Hathaway, a Berkshire Hathaway (NYSE: BRK-A) (NYSE: BRK-B) wannabe.

My solution for depression
Is the credit crisis bringing you down? Are you feeling more than a little sad and anxious? Well, CAPS blogger motleyanimal has the solution for you. Check out his blog to see how he battles the blues.

What drives oil prices
If you've been picking your jaw up off the floor lately while watching oil prices, you're not alone. On his blog, ATWDLimited took a look at the fundamental factors that are making oil prices the hottest thing since the .com suffix.

The return of floridabuilder
After a short hiatus, CAPS blog king floridabuilder is back in action. He's no longer fighting the tape, but he's just as much fun to read. Since his triumphant return, he's covered Lennar's (NYSE: LEN) baggage and NVR's (NYSE: NVR) rolling options.

The S&P 500 sector breakdown
If you've ever found yourself wondering what's really responsible for the performance of the S&P 500, you're in luck. CAPS player leanpockets has posted some really cool pictures on his blog that show how the S&P breaks down. If nothing else, it certainly emphasizes how much impact the financial sector has on the overall index!

And that's our roundup for this week. Be sure to check back 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:

Both Starbucks and Berkshire Hathaway are Motley Fool Inside Value and Stock Advisor recommendations, Amazon.com is a Stock Advisor pick, and the Fool owns shares of Starbucks and Berkshire Hathaway. Try any of our Foolish newsletters today, free for 30 days.

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