What a great week! I am joining the chorus of those who especially love Wednesday's outfit. What a great example of how to make an Audrey-ish little black dress look completely professional.
I've worn walking shorts to work last summer & this summer, too. I was really hesitant about it until I saw a few other women wearing cargo-style clamdiggers to work, and I figured that walk shorts in a dressy fabric would definitely be appropriate.
To add to Chris' suggestion, The Limited also had some cute looking walk shorts on their website a couple weeks ago if you are looking for a second pair.