Info on the controls,
http://witcher.wikia.com/wiki/The_Witcher_2_controls
and inventory.
http://witcher.wikia.com/wiki/The_Witcher_2_inventory
These links above come from the Witcher/Witcher 2 Wiki. When you do a search in this extensive wiki, make sure you put Witcher 2 in the search terms so that you end up with information for the right game.
http://witcher.wikia.com/wiki/Portal:The_Witcher_2
This is the best walk-through I've found. The combat/skill trees explanation is good, too (second link).
http://www.gamespot.com/features/6313939/the-witcher-2-walkthrough-game-guide/p-3.html
http://www.gamespot.com/features/6313939/the-witcher-2-walkthrough-game-guide/p-3.html
http://www.gamespot.com/features/6313939/p-2.html
Good walk-through with MAPS
http://guides.gamepressure.com/thewitcher2assassinsofkings/
Good walk-through with MAPS
http://guides.gamepressure.com/thewitcher2assassinsofkings/
List of crafting diagrams (hyperlinked)
http://witcher.wikia.com/wiki/Category:The_Witcher_2_crafting_diagrams
How to craft video
http://www.youtube.com/watch?v=X7keASCNr-c
This site has good information on combat,
http://segmentnext.com/2011/05/23/the-witcher-2-combat-guide/
character skills, abilities and the talent tree,
http://segmentnext.com/2011/04/29/the-witcher-2-character-skills-and-talent-tree-guide/
a guide to alchemy/potions/bomb making,
http://segmentnext.com/2011/05/15/the-witcher-2-alchemy-guide-potions-oils-and-bombs/
a guide to the characters in the game,
http://segmentnext.com/2011/05/16/the-witcher-2-characters-guide
as well as a guide to fistfighting,
http://segmentnext.com/2011/05/15/the-witcher-2-fistfighting-guide/
how to play dice and poker,
http://segmentnext.com/2011/05/15/how-to-play-dice-poker-in-the-witcher-2/
and a guide to sex in the game.
http://segmentnext.com/2011/05/27/the-witcher-2-romance-sex-guide/
There is also a list of problems and fixes.
http://segmentnext.com/2011/05/18/the-witcher-2-crashes-fps-fix-sli-fix-ati-graphics-nvidia-performance-no-sound-errors-and-fixes/
Guide to Mutagens
http://www.gamefaqs.com/boards/975399-the-witcher-2-assassins-of-kings/59176466?page=1
Mods List (Witcher 2)
https://docs.google.com/document/pub?id=1YwUe7RqYlYi5NSB5LonVPO6NlQmlCIChGHTRc9XxnS0
Best Mods Downloads (Witcher 2)
http://witchernexus.com/downloads/top/alltime.php
Mods List (Witcher 1)
http://witcher2game.com/2010/06/must-have-mods-for-the-witcher/