As IDLE is the 'official' python editor and PEP 8
(Style Guide PEP) suggests that coders wrap lines at 79
characters, I propose that IDLE should assist this
practice by highlighting lines or parts of lines longer
than 79 chacacters, or something similar. It is
suggested that this be a pref toggleable in the
"Configure IDLE" window and be turned on by default to
encourage good coding practices.

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I would find this to be an annoyance.
Passing to Kurt for pronouncement.

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I'd agree with Raymond.  Three things have been done to help
with this: first, the default window width is set at 80 char.
Second, there is a column number indicator in the lower right,
it's easy to keep an eye on it when you're typing a long line.
Finally, there is a paragraph formatting feature which will
re-wrap comments and doc strings to a configurable width.

Now if Sourceforge could just do something clever to fix the
farging line wrap in these comment windows....