Technical Overviews:

        Here are a couple of recent technical overview articles on asynchronous ("clock-less")
        digital design.  The first summarizes recent advances.  The second is an in-depth
        introductory monograph (it includes a 23-page history of the field, see sec. 6).

• "Scanning the Technology:  Applications of Asynchronous Circuits",
C.H. van Berkel, M.B. Josephs and S.M. Nowick,  Proceedings of the IEEE, vol. 87:2,
pp. 234-242 (Feb. 1999).  (pieee99.ps , pieee99.pdf )
 
• "An Introduction to Asynchronous Circuit Design",
A. Davis and S.M. Nowick, University of Utah technical report, Department of Computer Science,
UUCS-97-013 (Sept. 19,  1997). ( tr-intro-97.ps ,tr-intro-97.pdf )
 

A more informal and readable overview on asynchronous design is the recent cover story in  "Technology Review" Magazine:

     "It's Time for Clockless Chips" :   Cover story in  Technology Review Magazine,
    October 2001, vol. 104:8 (pp. 36-41).  (Includes a short interview with me.)