Pre-Marketing 3.31.11

* What did he trade, and when did he trade it? A timeline of David Sokol’s Lubrizol purchases

* Dean Takahashi: The 7 ideas everyone can learn from game designers

* Felix Salmon: Alan Greenspan squanders his final reserve of credibility

* Audio: Biz Stone tells Howard Stern about Facebook’s failed attempt to buy Twitter

* Morning Call: U.S. futures look flat, London rises earlyEuropean shares fall ahead of Irish bank tests and the Nikkei gains 0.5%.

* The Fed rejects AIG’s (AIG) offer to repurchase $15.7 billion of mortgage securities. AIG boss calls it a “huge problem for us.”

* Seamus Mac Gorain: Trade the weather, not consensus

* Counter-intuitive? Recession causes sharp decline in startups

* Scott Austin: Sequoia Capital keeps the Chinese IPO hits coming

* Jamie Dimon apparently agrees with Meridith Whitney’s worst-case scenario of municipal defaults.

* Bill Gross warns that America will default without major entitlement reform. And he does so via a Pepé Le Pew analogy.