Author of "The Duality of Technology", the first paper I saw that looked at IT adoption (in particular groupware adoption) through the lens of structuration theory.
Get access to the files on your desktop computer from your wireless PDA or cell phone. You're a hacker? then why stop with your own desktop - the world is your oyster!
Seminal paper on why a lot of multi-user software projects - nay, most such project - either fail abysmally or succeed and leave a trail of unhappy end users who resist or refuse the product altogether.