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Just finished reading Moneyball, and in it there is mention that (at the time at least) OBP was rendered about 3x more valuable in the marker than was SLG. OPS treats them equally (OBP+SLG), but is there a stat out there that is the product of (3)OBP+SLG?

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GPA is Gross Production Average and equals (1.8 x OPS + SLG)/4 and has a higher relationship to run creation. The "/4" part is just a normalization factor that makes the stat line up with traditional notions of Batting Average: i.e. .200 is terrible, .265 is average, and .300 is good.