Where can I find the best FAQs and strategy guides online for StarCraft II? Are there already walk-throughs for portions of the single-player game, perhaps as released in other countries, and translated?
As of the time of asking, 7/22/10, there are no FAQs or strategy guides out for the single player, because the single player hasn't yet been out. Short of a boot-leg copy of the Official Strategy Guide (which also goes on sale next week) you're out of luck.
However, some of the fan sites do have reviews posted of the single player stuff they were able to see at press conferences etc.
No single player guides are available yet as the game is not released anywhere. The beta had no campaign missions available. But, for help on getting better at the game I would recommend browsing team liquid's SC2 forums: http://www.teamliquid.net/forum/index.php?show_part=19
Watching day shoutcasts: http://day9tv.blip.tv/
and watching huskystarcraft: http://www.youtube.com/user/HuskyStarcraft
SC2 armory also has some useful stuff: http://sc2armory.com/