Really interesting work on concerning the issues(technical and social(e.g. privacy, security)) around RFID. I haven't read either of the papers mentioned in this post (both will be presented at CHI'10) yet, but I look forward to doing so. Work like this, along with the work RFID that Timo Arnall and Jack Schulze are doing, should yield fertile ground for ideas toward building, understanding and evaluating ubiquitous computing systems with RFID that give maximal benefits and minimal detriments to the human ecology. - Cornelius Toole