In case you missed it, Kevin Millwood was placed on the disabled list today, and the Rangers purchased the contract of Doug Mathis. After needing 8 1/3 innings from the bullpen yesterday, Mathis was added so that the Rangers had a fresh arm in the pen. Millwood's spot in the rotation can be skipped, meaning that the Rangers don't have to use someone to replace him until May 20, and I guess Mathis could end up getting that start.
In addition, the Rangers announced that Kaz Fukumori cleared waivers and has been outrighted. This clears a spot on the 40 man roster, which they'll need before too long to make room for John Rheinecker or Thomas Diamond.
I thought Fukumori might be a possible 40 man casualty, given how he's struggled, and given that the Rangers, at this point, probably wouldn't have been devastated if a team claimed Fukumori and took his $3 million, 2 year contract off their hands. He stays under team control, and I'd guess he probably won't be back in Texas until August, at the earliest.