  The mid-IR flux ratios F_A/F_B = 2.84 +/- 0.06 of the two images of the
gravitationally lensed quasar HE 1104-1805 show no wavelength dependence to
within 3% across 3.6-8.0 um, no time dependence over 6 months and agree with
the broad emission line flux ratios. This indicates that the mid-IR emission
likely comes from scales large enough to be little affected by microlensing and
that there is little differential extinction between the images. We measure a
revised time-delay between these two images of 152.2 +2.8-3.0 days from R and
V-band data covering 1997 to 2006. This time-delay indicates that the lens has
an approximately flat rotation curve over scales of 1-2 R_e. We also observed
uncorrelated variations of ~0.05 mag/yr which we attribute to microlensing of
the optical emission from the accretion disk. The optical colors have also
changed significantly in the sense that image A is now redder than image B,
rather than bluer as it was in 1993.
