Found this at Sportsline:
--DH-1B Frank Thomas entered Sunday on a 10-game hitting streak (16-for-37, .432), raising his batting average from .247 to .282 in that span. Nine of those 10 starts have come since manager Jerry Manuel began starting Thomas at first base. That's why Thomas will remain at first base through most of the games this week, even though the Sox will no longer be short the DH because of interleague play in NL parks. "I don't know, maybe my mind has cleared a little bit since playing first base," Thomas said. Over his 14-year career, the veteran has hit .337 with a .453 on-base percentage and .623 slugging percentage when playing first base, compared to a .283 average with a .407 on-base percentage and .502 slugging percentage as the DH. "Looks like he's better at first base, reality or not," Manuel said. "We'll have to play with him there (even with the DH role in the lineup again)."
So looks like he may get 1B eligibility soon. I picked him up in my mid-season league. Dropped Burnitz for him.