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With a fresh install from python-2.7rc2.amd64.msi (rc1 is also affected) multiprocessing gives the following error:
Python 2.7rc2 (r27rc2:82154, Jun 22 2010, 21:22:29) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import multiprocessing
>>> multiprocessing.Pool()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Python27\lib\multiprocessing\__init__.py", line 227, in Pool
 return Pool(processes, initializer, initargs, maxtasksperchild)
 File "C:\Python27\lib\multiprocessing\pool.py", line 89, in __init__
 self._setup_queues()
 File "C:\Python27\lib\multiprocessing\pool.py", line 181, in _setup_queues
 from .queues import SimpleQueue
 File "C:\Python27\lib\multiprocessing\queues.py", line 22, in <module>
 from multiprocessing.synchronize import Lock, BoundedSemaphore, Semaphore, Condition
 File "C:\Python27\lib\multiprocessing\synchronize.py", line 22, in <module>
 from multiprocessing.forking import assert_spawning, Popen
 File "C:\Python27\lib\multiprocessing\forking.py", line 158, in <module>
 from ._multiprocessing import win32, Connection, PipeConnection
ImportError: No module named _multiprocessing
I noticed that _multiprocessing.lib is not in Lib/multiprocessing/ but in libs/, so I don't know why there is a relative import here.
Changing all the occurrences to
 from _multiprocessing import ...
everything works fine.