2009: 45-43 / 34-40 (.511 / .459)
2008: 54-41 / 35-33 (.568 / .515)
2007: 39-47 / 33-43 (.453 / .434)
2006: 57-31 / 33-41 (.648 / .446)
2005: 57-29 / 42-34 (.663 / .553)
2004: 46-38 / 37-41 (.548 / .474)
Total: 298-229 (.565) / 214-232 (.479)
Those are the first and second half W-L splits since Guillen became the skipper. Now, I propose you take away the outliers, 2005 and 2007 (our best and worst records) and you get: 139-155 (.472) in the second half. I think we would all agree that our current roster isn't as dominant as the 2005 going forward, and no where near as bad as the 2007 roster. We're somewhere inbetween. Probably somewhere closer to 2008's roster.
Now, there are two positives to note here. The years the Sox made the playoffs (2005 and 2008) they had above .500 records in the second half. The negative here is, however, that the Sox had considerable dropoffs as well those very years. Their torrid pace in the first half those years put them in position to be able to stumble and still make it first to the finish line. The 2010 White Sox don't have the cushion they had.
I've shown you the stats, what do you make of it? Do you think it matters going forward? Tdogg, you're the sunshine that blows up my rear, what do you make of it?