SA Editor Eli Hoffmann: Barron's takes a detailed look at recent moves of Berkshire Hathaway (BRK.A) master investor Warren Buffett. Key takeaways:
* While publicly tepid on the stock markets, Buffett bought a record $19 billion in equities in 2007, more than double the $9.2 billion he picked up in 2006. Berkshire's equity portfolio is now worth $75B, up from $61.5B in 2006 and $37B in 2004.
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