Over at BTB, there's a good, lengthy post chock full of graphs analyzing disabled list data from 2002-2008, in terms of teams, positions, types of injury, and the like.
During that span, the Rangers have had more trips to the d.l. than any other team (over 140, compared to fewer than 60 for the ChiSox), although they are "only" sixth in the majors in days lost, at just under 8000 (compared to around 2000 days lost to the d.l. for the Astros).
Interesting data...check it out...