Today Amazon.com has announced their financial results for the fourth quarter ended December 31, 2011. Their net sales have increased 35% to $17.43 billion in the fourth quarter. The company’s operating cash flow increased 12% to $3.90 billion compared to $3.50 billion for the trailing twelve months in the year before. Free cash flow decreased 17% to $2.09 billion.

Amazon.com has released information about how many Kindles have been sold during the holiday season. In December alone, four million Kindles have been sold. “We are grateful to our customers worldwide for making this the best holiday ever for Kindle,” stated Amazon.com founder and CEO Jeff Bezos. The #1 and #4 best-selling Kindle books released in 2011 were also both published independently by their authors using Kindle Direct Publishing.

Comedian Conan O’Brien has put together a funny skit about how to go about fixing the Kindle Fire using an actor playing Jeff Bezos. The actor makes some excellent suggestions such as putting duct tape over the power button. I’ll let you judge the rest in the video above. [Fortune]

Uber is a private car service company that has raised $32 million in Series B funding from Menlo Ventures, Goldman Sachs, and Jeff Bezos. Previous investor Benchmark Capital also participated in this round.

Amazon.com, Inc. (NASDAQ:AMZN) CEO and founder Jeff Bezos has become extremely aggressive when it comes to selling smartphones this holiday season. Amazon.com has started selling every non-iPhone smartphone for $0.01. The smartphones cost $0.01 with a 2 year contract. The smartphones that are on sale include the Motorola Droid Razr, the Samsung Galaxy S II, the Epic 4G Touch, the HTC ThunderBolt 4G, the Samsung DROID CHARGE 4G, the BlackBerry Torch 4G, etc.

Amazon.com, Inc. (NASDAQ:AMZN) has published a press release today that reveals that their customers are buying more Kindle books than print books (hardcover & paperback) from them. Amazon.com started selling books in July 1995. The original Kindle was released in November 2007.

In an interview with Consumer Reports, Jeff Bezos replied “stay tuned” when asked about Amazon.com possibly building a multipurpose tablet. “We will always be very mindful that we will want a dedicated reading device,” said Bezos. “In terms of any other product introductions, I shouldn’t answer.” [Consumer Reports]

Amazon.com, Inc. (NASDAQ:AMZN) has recently reported their first quarter 2011 financial information. They posted $9.86 billion in revenues for the first quarter, which puts them up 38% during the same quarter last year. But Amazon.com’s net income has decreased 33% to $201 million for the first quarter. During the same quarter last year, Amazon.com reported a net income of $299 million.