The Angels have made nearly everyone available, as they try to rework their roster for next year and beyond. The Yankees have been looking for help at third base, and they don't appear to be Michael Young's first choice (or even his second).
Other teams have also asked the Angels about Callaspo, whose .671 OPS is more than 100 points higher than what Yankee third basemen have done so far. The Yankees are 30th among the 30 big-league teams in almost every offensive category at third base, where they've already used seven different players (most recently Brent Lillibridge).
The Yankees theoretically have Alex Rodriguez coming back to play third base, but even if A-Rod is physically capable of playing, the coming Biogenesis suspensions could well rule him out as an option.