I've written and appended with this message a small script using
tkinter, that produces the same crash as described earlier with turtle.py:

tkinter_recursion_31.py

It occurs when heavily and fast dragging the red square. So the bug
doesn't depent on turtle.py

I'd like to mention again, that the corresponding script under Python26
does crash also, but with a regular Python Error-Message. It does not
kill IDLE when stated from within IDLE.

So I'd suggest to give this one a higher priority. Should be fixed with 3.2

Regards,
Gregor