Tumult surrounds Sumner Redstone these days, and the least of it may be his pending divorce.

In what looks like a margin call of massive proportions, billionaire media tycoon Sumner Redstone is being forced to unload $400 million worth of nonvoting shares in CBS and Viacom.

Long before David Letterman immortalized the Top 10, publishers figured out that readers love lists.

Magazine cover stories rank the best places to live, the best places to do business, the world’s richest people. The internet, of course, is a bit more creative. A quick Google search for the phrase “top 10″ yields, after Letterman:

· Top 10 naked people on Google Earth
· Top 10 ways to destroy earth
· Top 10 urinals (somebody’s doing some serious SEO here)
· Top 10 strangest Lego creations (ditto)
· Top 10 spammers

Egos are colliding.

Two years after Paramount Pictures paid a reported $1.6 billion for DreamWorks studios, the ego-fueled relationship is headed toward a messy divorce.

Steven Spielberg and his DreamWorks partner David Geffen have felt slighted that they haven’t gotten more independence and credit within Viacom Inc., which owns Paramount Pictures, given the success of their movies this summer, according to the Los Angeles Times.

Differences with her father, Sumner Redstone, have led Shari Redstone to consider selling her 20% stake in the family business, National Amusements.

Sumner Redstone posted a letter on Forbes.com Friday, saying he would weigh a fair offer from his daughter. Ms. Redstone issued a statement later in the day saying she would consider a sale, and noting that National Amusements had been “publicly valued at $8 billion.”