Free CCNA Resources

Exam Topics For Every Cisco Cert:
http://www.cisco.com/web/learning/le3/learning_career_certifications_and_learning_paths_home.html

CCNA Textbooks:
http://www.itcertguides.com/
http://www.routeralley.com/ra/guides.html 
http://www.cisco.com/en/US/docs/internetworking/technology/handbook/ito_doc.html
http://www.ccnahelp.com/ 
http://ciscotests.org/ccna.php
http://docwiki.cisco.com/wiki/Internetworking_Technology_Handbook

CCNA Lab Manuals:

Free CCNA Workbook.  The gold standard in free online CCNA hands on training.
http://www.freeccnaworkbook.com/

This next lab manual is a .pdf download.  While it's a bit dated and some of the topics included are not relevant to the current CCNA exams, there's still a lot of good material here.
http://www.lulu.com/product/ebook/ccna-version-5-draft/930539

101 CCNA Labs:
http://www.howtonetwork.net/public/department140.cfm

Some great labs for CCNA topics and more:

http://www.routeralley.com/ra/labs.html

Here's an awesome site full of lectures and lab notes from Dr. Kenneth M. Chipps on a wide range of networking topics:

http://www.chipps.com/index.html

NetSimK CCNA Network Simulator:

http://netsimk.com/

Here's a few Packet Tracer activity files:

https://learningnetwork.cisco.com/thread/4933 

Probably a bit beyond the CCNA topics.  But it's labeled as CCNA Lab Projects, so why not step outside your comfort zone and learn a little.

http://jjrinehart.wordpress.com/2011/06/02/ccna-lab-projects/ 

GNS3 Info and Labs:

http://www.gns3-labs.com/
http://gns3vault.com/

http://www.blindhog.net/category/dynamips/

Subnetting:
http://www.learntosubnet.com/
http://www.subnettingquestions.com/
http://www.techexams.net/technotesnew/158-ipv4-subnetting-guide.html

Youtube resources:
The Bryant Advantage - http://www.youtube.com/user/ccie12933
Todd Lammle - http://www.youtube.com/user/lammledotcom
Cisco - http://www.youtube.com/user/Cisco
CiscoPress - http://www.youtube.com/user/CiscoPress
Kevin Wallace - http://www.youtube.com/user/kwallaceccie
Free CCNA Workbook - http://www.youtube.com/user/FreeCCNAWorkbook
Palaestra Training - http://www.youtube.com/user/palaestratraining
Pancho Training - http://www.youtube.com/user/panchotraining
TrainSignal - http://www.youtube.com/user/TrainSignalInc
Bowler CBT Labs - http://www.youtube.com/bowlersp
Keith Barker - http://www.youtube.com/user/Keith6783
CBT Nuggets - http://www.youtube.com/user/cbtnuggets
81 Part Series - http://www.youtube.com/playlist?list=PLEDA4CC4D696B957D

Blogs:
Wendell Odom - http://www.networkworld.com/community/odom
Wendell Odom (New) - http://www.certskills.com/About/WendellOdom.aspx
Todd Lammle - http://www.lammle.com/blog
PacketLife - http://packetlife.net/
INE - http://blog.internetworkexpert.com/
IPExpert - http://blog.ipexpert.com/

Forums:
http://www.techexams.net/forums/
http://www.networking-forum.com/
http://www.lammle.com/discussion/

Free Practice Exams:
http://www.knowledgebuster.com/
http://www.pearsonitcertification.com/promotions/promotion.aspx?promo=138159
http://www.techexams.net/ciexams.shtml
http://www.techexams.net/practice-exams/take/cisco-subnetting
http://www.internetworktraining.com/quiz.aspx 

and a couple fun ones:
http://valerieaurora.org/tcpip.html
http://sock-raw.org/netsec/tcpipdrink.html


Misc Articles by Topic:
2900XL vs 2950 switches
Cryptography
Ethernet
IPSec
NTP
PuTTY related links
T1
VoiP

How do I know if a web resource is legit?
http://www.certguard.com/

A shameless plug for my Facebook CCNA Group:
http://www.facebook.com/groups/2210858047/

A little humor:

http://www.routergod.com/

Another Big Link Collection:
https://learningnetwork.cisco.com/thread/15662