Paul Kovacs
CompTIA Network+ Resources
Keith Baraker Network+ Videos
A set of videos covering a number of topics.
CompTIA-N10-005 Network+ Videos by professor Messer
This site is another Web based set of videos that cover a number of topic.
IT encyclopedia and learning center.
Definitions of thousands of the most current IT-related words.
Pactice questions for the N+ exam  -scroll to the bottom of the main page and look for the "Master Dumps" heading. From there look for CompTIA, then the N10-002 link.