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$ python
Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from lxml import etree
>>> from pickle import dumps
>>> from multiprocessing import Pipe
>>> n = etree.Element('new')
>>> dumps(n)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python2.6/pickle.py", line 1366, in dumps
 Pickler(file, protocol).dump(obj)
 File "/usr/lib/python2.6/pickle.py", line 224, in dump
 self.save(obj)
 File "/usr/lib/python2.6/pickle.py", line 306, in save
 rv = reduce(self.proto)
 File "/usr/lib/python2.6/copy_reg.py", line 70, in _reduce_ex
 raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle _Element objects
>>> p1, p2 = Pipe()
>>> p1.send(n)
>>> p2.recv()
Segmentation fault

Can't reproduce on Python 2.7, but can indeed reproduce on 2.6. Issue fixed?

On Python 2.7.2 this can not be reproduced. Instead of the segmentation fault an AssertionError is raised:
AssertionError: invalid Element proxy at 39359432
In Python 3.2 the p1.send(n) step in the example raises a PicklingError when trying to pass an unpickable object.
Recommend closing this ticket.