Please see:

 http://brahms.phy.vanderbilt.edu/~rknop/fidcolors.ps
 http://brahms.phy.vanderbilt.edu/~rknop/wfpcrep.ps

The first has some literature bashing I did to figure out what the
"real" BVRI colors of a Type Ia supernova is; some of you have seen this
before.  I used this to modify Peter's uberspectrum.  (You can find the
current version of my modified uberspectra on
http://brahms.phy.vanderbilt.edu/~rknop/uber, but be aware that I *will*
be changing these uberspectra as I find and fix problems.  Everything is
prelimninary!!!!)

The second link above has the current hubble diagrams and Omega/Lambda
contour plots for the 11 HST supernovae, considering only the WFPC data
and applying no host galaxy extinction corrections.  There is also a
note on the colors of the supernovae, which are all too blue, but which
I'm beginning to come up with an explanation for.  I'm only confident
saying that one of the eleven supernovae is reddened.  I'm not confident
saying much of anything about the colors or the reddening of the other
10, other than "they probably aren't reddened much".

-Rob