If you have anything too add to this list, please post here.
General Internet
http://www.adslguide.org.uk/
http://www.ispreview.co.uk
http://www.net4nowt.com
http://news.zdnet.co.uk/0,,t293,00.html
http://www.internettrafficreport.com
General Networking
http://www.practicallynetworked.com
http://www.networklab.co.uk
Connection Sharing
http://www.analogx.com/contents/down...work/proxy.htm
http://www.avirt.com/soho/content.html
http://soho.sygate.com/products/gate_ov.htm
http://www.deerfield.com/products/wingate/
http://www.practicallynetworked.com/sharing/ics/ics.htm
http://firingsquad.gamers.com/guides/ics/
http://www.smoothwall.org
http://www.quarkav.com/SmoothWallGPL/index.php - Smoothwall Info
ADSL
http://www.broadband-help.com
http://www.world-of-adsl.com
http://www.adslguide.org
http://www.dslreports.com/
http://www.dsl.net
http://www.everythingdsl.com/
Cable
http://homepage.ntlworld.com/robin.d...ips/index.html
http://www.cable-modems.co.uk
http://www.broadband-help.com
http://www.cw2000.org
http://www.broadbandnorfolk.co.uk
http://www.broadband-kb.co.uk
Connection Tweaking
http://www.speedguide.net/index.shtml
http://www.optimizing.net
Speed Tests
http://www.numion.com/YourSpeed/
http://www.vantage.pwp.blueyonder.co.uk/ (for any Broadband incl NTL, BY, BT, Pipex and TELE2)
http://bandwidthplace.com/speedtest/
http://www.blockbuster.co.uk/common/speed.asp
http://www.adslguide.org.uk/tools/speedtest.asp
http://www.zdnet.co.uk/misc/band-test/
http://www.dslreports.com/stest
IP and Connectivity Tracing
http://visualroute1.datametrics.co.uk/
Spyware Removal
http://www.lavasoftusa.com/
http://www.spyware.co.uk
Network Security
http://www.sans.org
http://www.grc.com
http://www.netcraft.com/security/
Dynamic DNS Services
http://www.dns2go.com
http://www.no-ip.com
Port Forwarding
http://www.practicallynetworked.com/..._port_list.htm
http://ucguides.savagehelp.com/
Cat5 Network Wiring Guide - For Crimping Your Own Cables