Via Baseball America's transaction page, we see that the Astros have signed RHP Hector Corpas.
As Matt Eddy notes:
Released by the Cardinals in December, Hector Corpas rejoins Jeff Luhnow and other former members of the St. Louis front office in the Astros' remade front office. Corpas signed out of Venezuela in ’07 and advanced to low Class A in the Cardinals system.
Corpas is 6'3", 170lbs, and spent 2011 with St. Louis' single-A team, where he had a rough go of it: 39.2IP, 48H/32ER, 31K:17BB, for a 7.26 ERA/1.64 WHIP.