Might I suggest this blog as well?

I think it's a collection of both professional and student work from around the interwebz.

N Freise:

<img src="http://farm3.static.flickr.com/2558/3806821935_a3436d9fbe_o.jpg" />

dammit

http://farm3.static.flickr.com/2558/3806821935_a3436d9fbe_o.jpg

ugh

one more:

My favorite urban sketcher:

Gerard Michel

Seems to me it's about time to revive this wonderful thread ....

Are you guys familiar with Stephen Wiltshire. Pretty impressive. He is a savant that draws cityscapes from memory.

http://www.stephenwiltshire.co.uk/download_video.aspx?Id=3578