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now() and fromtimestamp() now do "the right thing" with their 
optional tzinfo argument.  The argument name was changed 
to "tz", BTW, as "tzinfo" had enough meanings already.  
Appropriate changes were checked into the Python 
datetimemodule.c and Zope3 _datetime.py implementations, 
+ their test suites and LaTeX docs.

Guido, your complaint about astimezone() was incidentally 
fixed in checkins prior to this -- astimezone() no longer 
supports converting between naive and aware datetimes, and 
also complains if the tzinfo object's utcoffset() or dst() 
methods return None.