CCNA Guide

Blog

http://www.depacket.com/
http://kasl33.blogspot.com/

Routing Basic
http://www.joshgentry.com/cisco/cisco.htm
http://www.cisco.com/en/US/docs/internetworking/technology/handbook/Routing-Basics.html

Subnetting
http://www.joshgentry.com/networking/subnet.htm

Cisco Quick Tips
http://www.joshgentry.com/cisco/cisco-quick-tips.php