Peeking over shoulders..

Dan witz
buff monster

Zephyr

Quite a while back wooster did a series of "artists workspaces" with whole bunch of great people showing us into that sacred place where it all happens... There is alot of spaces to look at so i'll post a few to get you started.
http://www.woostercollective.com/2005/01/artist_workspaces_1.html

http://www.woostercollective.com/2005/01/artist_workspaces_2.html

http://www.woostercollective.com/2005/01/artist_workspaces_3.html

http://www.woostercollective.com/2005/01/artist_workspaces_4.html