I found this at Uncommon Descent:

When we visited the zoo the other day, my wife snapped this photo just outside of the Panda play area. I guess when they put together the verbage for the sign, they neglected to consult Gould because I didn’t read “looks jury-rigged” anywhere on there.

Further down in the comment thread, Markus Rammerstorfer has posted snippets from a Nature article on the Panda's Thumb:

The way in which the giant panda, Ailuropoda melanoleuca, uses the radial sesamoid bone — its ‘pseudo-thumb’ — for grasping makes it one of the most extraordinary manipulation systems in mammalian evolution..... We have shown that the hand of the giant panda has a much more refined grasping mechanism than has been suggested in previous morphological models.
Endo, H et al. (1999): Role of the giant panda’s ‘pseudo-thumb’ Nature 397: 309-310

Sub-optimality is not, of course, a decisive blow to ID. Nevertheless, it's nice to see another example of how first assumptions based on evolutionary theory have been proven incorrect by further research. At the very least, it shows that sub-optimality claims need to be based on solid research, and not the ad-hoc "it is obviously not optimal" claim which passes for an argument against design in some circles.