Educational/Instructional sites:

Cisco's Web Site

Router god (Funny instructional site for Cisco related routing topics)

Laura Chappel (Sniffer related training site)

IETF (Looking for an RFC?)

ATM Computer Based Training

Subnetting questions galore!

Funny sites:

Engrish (Straight from Japan.... it's butchered English)

Demotivators (You've seen them, the funky posters that are all around corporate America)

The Subservient Chicken (Finally! A guy in a chicken suit that will do whatever you ask him to!)