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General:

• Is floating point math broken?

C:

• Do I cast the result of malloc?
• Difference between ++*argv, *argv++, *(argv++) and *(++argv)

Python:

• Why you don't want to dynamically create variables
• Why does a == b or c or d always evaluate to True?
• “Least Astonishment” and the Mutable Default Argument

Java:

• Is List<Dog> a subclass of List<Animal>? Why aren't Java's generics implicitly polymorphic?

Here and here are some other nice bookmarks.

Otherwise helpful:

• MCVE and SSCCE
• XY problem