What can I say, I like the irony of putting ways to avoid spoilers in the one place other purists will never look for them.
1 Avoiding Internet Spoilers: Unfortunately, typing keywords into a search engine to find sites that are part of this game will also bring up numerous sites that have walkthroughs for the game. One line in a description can ruin puzzles before you even realize what youve read. The games own SKL site has a search section that automatically adds -missing as a modifier to Google or MSN searches. Alternately, search using your own favorite engine and make sure to include -memoriam and/or -missing every time to eliminate walkthroughs from the results.
2 Avoiding E-mail Spoilers: Other people investigating the case will send you hints and clues whether you want them or not. The trigger system is based in part on what you have accomplished since the last time you logged into the black disc with an active internet connection. Sometimes this results in the game misinterpreting your progress and sending a clue or hint before you need it (or worse, one that you dont want to see). The best way to avoid this is to not read any game e-mails*. That does tend to take away from the story though so try this instead: Every time you complete a full set of puzzles, exit the game. Make sure you are connected to the internet then restart the game. Wait a few minutes for things to catch up then read all your messages. Now, dont go back to your e-mails until you finish the next full set of puzzles or you get really stuck. This should help minimize accidental messages.
* For old school hardcore types, it is possible to complete this game while reading only one e-mail. A second e-mail is required if you are afraid of using a little brute force. Rot-13.
Must read: FBHAQGBBYSBEINEV SEBZTREL (mid to late game)
Might need to read: WNPXYBEFXVPNFR SEBZTREL (very early on)