I'm having a hard time picking a photo this week, so I'm just going to go with popular consensus on this one (ie: which photo has received the most views, comments, and favorites via my flickr account). The winner is:
Nikon D7000 w/ 16-85mm lens, 1/640sec at f8, ISO400. © Andy Marfia 2011 All Rights Reserved.
That's Chicago's Trump Tower with the Mies van der Rohe designed IBM Building. A nice architectural contrast, I think, as both are clad in glass and steel but are clearly from different eras-- Trump is just a few years old, where as IBM was build in 1969.
I lost a little bit of highlight detail in this one. I left that as is in post processing, adjusting the shadows slightly to further exaggerate the contrast between the buildings.