Yes, look at Ortiz's #s and see that upon hitting his prime (late 20s for drug-free mortals), being healthy, playing full time, and having quality hitters protecting him in the line-up, he produced mightily. He uses the Green Monster better than any lefty since Wade Boggs. He works hard - played winter ball last off-season. There is such a thing as natural improvement, it just doesn't happen in one's 30s (Bonds).
But he only had 17 homers at home this season, as opposed to 24 on the road. Check the rest of his numbers out here:
http://sports.espn.go.com/mlb/players/stats?statsId=5909&context=batting
The reason I bring up Ortiz is that Sox fans should think long and hard before taunting the Yankees over Giambi. Anybody who thinks that the only players using steroids are the ones caught in the BALCO scandal is delusional. It's a problem in all of baseball, not just the Yankees.