Blawg  (law + web + log)
http://www.samizdata.net/blog/glossary_archives/002511.html

Blog (web + log)
(http://en.wikipedia.org/wiki/Blog)

Podcast [pod (portable on demand) + cast (broadcast)]
(http://en.wikipedia.org/wiki/Podcast)

Social Networking (user-generated content; Web 2.0)
(http://www.netlingo.com/lookup.cfm?term=social%20networking)

Wiki (www.wikipedia.com is best-known wiki)
(http://en.wikipedia.org/wiki/Wiki)

New Media Definitions

NetLingo
http://www.netlingo.com/index.cfm

Wikipedia
http://en.wikipedia.org/wiki/Main_Page