One other tidbit I left out of my original Astros piece (although I re-added it in a comment) was that 57 hasn't been given out since Darryl Kile died. As I originally said, though, Kile pitched longer and better with other teams. I still think of him more as a Cardinal. I just don't see number being retired.
In light of these, the revised Astros list (with some other updates in addition to those two):
Also, I added this in the comments of another piece as well, but I may as well continue here since this seems like the official place to do so. Tony La Russa got his number retired by the Cardinals a month or so ago, so I can update the Cardinals' list also: