IEEE Transactions on Industrial Informatics Special Section on Communication in Automation vol. 4, no. 1, February 2008 and vol.4, no. 2, May 2008 Organizers and Guest Editors: Gianluca Cena, IEIIT-CNR, Italy, and Francisco Vasques, University of Porto, Portugal   Guest Editorial:  Part 1 (vol. 4, no. 1, February 2008 ); Part 2 (vol.4, no. 2, May 2008) Contents: Part 1 (vol. 4, no. 1, February 2008 ); Part 2 (vol.4, no. 2, May 2008)