I have included a list of well used links for different things. While this list is by no means comprehensive, it will cover most situations.
http://viking.gurut.org//Maps.rar <<< Vikings maps
Live Replay on x1mp_001 : livereplay:GPGNET://88.191.143.136/SpinDrah.SCFAReplay <<< Live replay link
http://176.31.202.229/forums/ <<< faf forums
http://forums.gaspowered.com/viewtopic.php?f=2&t=52357 <<< patches
http://scst.myvowclan.de/ <<<< vow web stats
http://cbe002.chat.mibbit.com/?server=1 ... =%23Aeolus <<-- faf lobby
http://forums.gaspowered.com/viewtopic.php?f=2&t=52273 <<-- faf download
http://88.191.143.136/faforever/replays/ <<< faf replays
http://forums.gaspowered.com/viewtopic.php?t=12752 <<< Getting 'verify system specs' message after a recent patch?
http://thevault.gaspowered.com/gpgnetdo ... .5.225.zip <<< gpgnet download <<< gpg vault
Best custom maps Mappack[Updated|More Images] http://forums.gaspowered.com/viewtopic.php?t=28974 << mappack
2 People behind router http://forums.gaspowered.com/viewtopic.php?t=2592 << 2 people 1 router
Novak made this Nat tracer http://supcomdb.com/stuff/conntest.zip <<< nat tracer
Forged Alliance unit database http://www.supcomdb.com/db/ <<< forged allince unit database
Beginners Guides: 99 Windows Vista Performance Tips and Tweaks http://www.pcstats.com/articleview.cfm?articleID=2238 << windows tuning
Core Maximizer tool - version 1.03 http://forums.gaspowered.com/viewtopic.php?t=15556 << core maximizer
http://www.faforever.com/ << lobby installer and fix
http://www.cncfile.ru/supreme/scrm100.zip << replay manager
http://www.supcomdb.com/db/unit_list/2/3 << 3599 unit database
viewtopic.php?f=2&t=209 << desyncs and issues faf
https://sites.google.com/site/supcomreplaymanager/ << replay manager
viewtopic.php?f=3&t=378&p=3586&hilit=steam#p3586 << steam faf
http://forgedalliance.obliteratingwave.co.uk/exe.rar << exe files
viewtopic.php?f=3&t=408&start=0 << steam faf
If anyone else has any links that they think are appropriate, post them below and I will include them with full credit.