We had a nice discussion of salb's mOPS a while back. I just wanted to point out (because it was new to me) Mark Pankin's OPS work for SABR34 last july.

His conclusion:
Relative value depends on particular team

In most cases marginal OBP >= 2 SLG

Much higher for some lineup positions

"Improved" OPS:

-- OBP + SLG + (OBP - 0.340)
-- 0.340 is typical ML average in recent years
- Will be posted on www.pankin.com
We see that the marginal values depend somewhat on the
particular team, and in a lineup, the values can vary quite a
bit due to the strengths of the preceding and following
hitters. None of this is a surprise.
Based on overall average performance, an estimate that an
extra point of OBP is worth two or more of SLG seems
justified. Can use 2 to improve OPS by giving a "bonus"
point for each point OBP is above average or assessing a
"penalty" point for each point below average.

Interesting. A different slant than salb's and I just wanted to bring to to the attention of anyone who might not have known about Pankin's work. My apologies if this is obvious and well known.