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>>> import sys
>>> sys.setrecursionlimit(10000)
>>> class foo:
...     def __str__(self):
...             return str(self)
...
>>> import threading
>>> threading.Thread(target=foo().__str__).start()

Kills 2.3, 2.4, and 2.5 on Windows, and 2.3 and 2.4 on linux
(I can't test 2.5 on linux).  Running in the main thread on
Windows doesn't seem to be a big deal:

>>> import sys
>>> sys.setrecursionlimit(10000)
>>> class foo:
...     def __str__(self):
...             return str(self)
...
>>> try:
...     str(foo())
... except Exception, why:
...     print why
...
Stack overflow
>>>

Note that the above crashes 2.3 and 2.4 on Linux.

This is still a bug, at least in maintenance on 2.4. 
Suggested reopen.