This page tells how to get that behavior in most OS X applications. The long and short of it is this:

Create (or edit) the following file:

~/Library/KeyBindings/DefaultKeyBinding.dict

Add the following to the file:

{
        /* Remap Home / End to be correct :-) */
        "\UF729"  = "moveToBeginningOfLine:";                   /* Home         */
        "\UF72B"  = "moveToEndOfLine:";                         /* End          */
        "$\UF729" = "moveToBeginningOfLineAndModifySelection:"; /* Shift + Home */
        "$\UF72B" = "moveToEndOfLineAndModifySelection:";       /* Shift + End  */
}

One notable application that does NOT respect the KeyBindings is Eclipse. Fortunately, Eclipse has its own mechanism for changing KeyBindings. Go to the preferences -> General -> Keys, and then change the Start, End, Select Line End, and Select Line Start mappings to be what you want.

Happy typing!

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