Wilson Sonsini diversifies into Marissa Mayer's favorite pastryWhen a history of the decline and fall of Wilson Sonsini, Silicon Valley's preeminent law firm, is written, this will surely deserve a paragraph: The lawyers there are now defending cupcakes. Sprinkles Cupcakes, the Los Angeles bakery made notable by HBO's Entourage, is seeking to defend its trademarked dot patterns against imitators; the concentric circles denote flavors. (Shown here: a red velvet cupcake.) It is, I suppose, a question of intellectual property. And a client is a client. But taking on this case just illustrates how far Wilson Sonsini has fallen since the '90s, when IPO fees fattened its partners' wallets, and before it got wrapped up in stock-options scandals. The silver icing: This may lead to work representing Google executive Marissa Mayer, should an interloper ever trespass on the ideas contained in her spreadsheet of cupcake recipes.