a couple of recent'ish pieces from (freely accessible) ACM pubs:

ACM Queue - Beyond Instant Messaging - IM isn't just for play anymore. Find out what's next.

ACM Crossroads - Virtual Communities and Team Formation

ACM Ubiquity - Putting it all together with Robert Kahn
"The co-founder of the Internet recalls the non-commercial early days and looks at today's issues of fair use, privacy and the need for security."