Time Warner (NYSE: TWX) has filed its 10-K, complete with lots of discussion about the well-known challenges facing the company, as well as some new details on previously announced news. Some highlights below:

SEE ALSO: AOL Acquires Affiliate Marketing Network Buy.at

—Competition: Unlike in Google’s (NSDQ: GOOG) 10-K, TWX mentioned MSFT-YHOO head on: “The competition AOL’s advertising businesses face could intensify when Google’s acquisition of DoubleClick is completed and if Microsoft’s proposed acquisition of Yahoo! or other similar consolidations occur.”

—Buy.at: The filing discloses a $125 million price tag on its acquisition of affiliate marketing marketing network Buy.at, which was announced earlier this month, sans-price.

—Google’s Stake In AOL: As the company faces a decision about what to do with the non-access side of AOL, there’s been increasing attention to Google’s stake in it, and what it might do. D-day on this issue is drawing nearer: “Beginning on July 1, 2008, Google will have the right to require AOL to register Google’s 5% equity interest for sale in an initial public offering. If Google exercises this right, Time Warner will have the right to purchase Google’s equity interest for cash or shares of Time Warner common stock based on the appraised fair market value of the equity interest in lieu of conducting an initial public offering. The Company cannot predict whether Google will request the Company to register its 5% equity interest in AOL or, if requested, whether the Company would exercise its option to purchase Google’s interest at its then appraised value.”

—2007 Layoff Count: “During the year ended December 31, 2007, the Company incurred restructuring costs of $262 million, primarily related to various employee terminations and other exit activities… The total number of employees terminated across the segments in 2007 was approximately 4,400.” And there is more to come: “In the first quarter of 2008, Time Inc. expects to further reduce headcount, which will result in additional restructuring charges expected to range from $10 million to $20 million.”

—AOL Brand Value: An interesting new risk factor that wasn’t in last year’s 10-K talks about the negative value of the AOL brand: “AOL believes that the “AOL” brand is associated in the minds of consumers with its dial-up Internet access service, and AOL is seeking to build a portfolio of other brands, such as MapQuest and TMZ.com, that have a strong and more updated consumer association. If the AOL brand continues to be used to identify the AOL dial-up Internet access service as well as various web products and services, such as AOL.com, AOL Money & Finance and myAOL, this could lead to consumer confusion and exacerbate the challenges AOL faces in attracting Internet consumers to and engaging them on its web products and services.”