noted elsewhere

Andrejs Zavadskis
A Walk Through Durham Township
Brad Knapp
Christoffer Jon Sinnbeck
Deborah Lattimore
Else Kramer
graciform
Invisible Threads
National Geographic
Orbit 1
Paradise.Found
Red-colour news soldier
shutterbug
trashbat

Also recommended is Photojunkie's interview with Andrew of Worksongs, which is one of my favourite photoblogs. I would love to do more urban exploration, but frankly I lack the courage, so the abandoned hotel set from June are as adventurous as I'm likely to get unless I find someone willing to egg me on.