The Ultimate Quake Live Guide, by Yakumo.
Post 1: Hardware, Weapon Selection, Abbreviations And Common Terms
Post 2: Coloured Text / Names, The Console, Advanced Movement
Post 3: Config Files, Punkbuster, Playing Tips
Post 4: Demos, Configs Part 2, Yakumo's Cfg
Post 5: Crash Tutorial, Tiers, Quakelive Damage Chart, Quakelive Item Respawns, Useful Links
Post 9: Color Bright Skins & Extras
QuakeLive FAQs @ Holysh1t.
QuakeLive FAQs @ EUQL.
CVAR and commands list @ Holysht.
Greasemonkey Alternative Server Browser, by wn.
QuakeLive Map List - A very handy list of all maps available at the moment for QuakeLive and maintained with links, by epsy..
Steve's StrafeJump Tutorial - Good Quake 3 strafing tutorial.
Genesis: The Beginning Of - Quake 3 strafing and movement guide. Helpful for beginners.
Movement Training Map, by RAZ3R.
spz_train1 Strafe Run Map, by sprks
More..
CTRL+ALT+` opens console, com_allowconsole "1" enables console.
To link someone to your game, be in windowed mode, and click the Game Link at the top left. Pasting this URL in your browser will join the game.
cvar_restart completely resets your game settings, if they get screwed.
CFG files are located at:
XP: %appdata%\id Software\quakelive\home\baseq3\
Vista: %userprofile%\AppData\LocalLow\id Software\quakelive\home\baseq3\
Linux: .quakelive
Mac: ~/Library/Application\ Support/Quakelive
Holysh1t config generator, by Lashknife.
EmSixTeen's Custom HUD & config.
Post Your Custom HUDs thread @ QL forums (first pages are pretty basic).
Custom HUDs for Quake Live site, by ocin
Useful channels on IRC.
#quakelive - QuakeLive's official channel
#quakelive.support - QuakeLive Support channel (unofficial)
European
#qlpickup.eu - European pickup channel (TDM, CTF, iCTF, CA)
#spontan.ql - Spontan Games pickup channel (TDM, CTF, CA)
North American
#naqltdm - TDM pickup channel
#naqlctf - CTF pickup channel
#naqlca - CA pickup channel
#naql1v1 - 1v1 pickup channel
More @ Holysh1t.
Same idea as the CPL Mousefix, except it runs as a service and works on more than just XP.
Windows Cursor Acceleration Fix is a kernel-mode program for Windows 2000 and above
to disable Windows' cursor acceleration by patching win32k.sys of the Win32 subsystem in volatile memory.
It is meant to load with every system start, modify system memory
Topic is here, the files are also attached.
I don't have a Mac, but apparently this works like CPL Mousefix for OS/X. Check here. Alternatively, you can try the Mouse Acceleration Preference Pane for OS/X, here.