ENH: intersection on DatetimeIndex with empty fails for monotonic with anchored offset
ENH: ~ for DataFrame #2110
DOC: correct default sep in to_csv, close #2156
DOC: remove old reference to index uniqueness. close #2043
BUG: setitem with Timestamp #2155
BUG: ensure platform int in a few places
ENH: revert Index mutability change. improve performance of dropna by using take. related to #2162
BUG: get_indexer for MultiIndex does not raise Exception for non-unique #2101
BUG: Tick isAnchored inconsistencies #2150
BUG: Timestamp.astimezone returns datetime.datetime #2060
ENH: rank na_options top and bottom #1508
ENH: tweak na_option checking per #2159
ENH: error msg for inserting list into empty frame #2147
ENH: DataFrame where and mask #2109
BUG: index name in to_records #2161
ENH: at_time and between_time for DataFrame #2131
DOC: rls notes
BUG: exclude timedelta64 from integer dtypes #2146
a panel constructed with a None value throws an error (0.9 exhibits the same behavior)

Python 2.7.3 (default, Jun 21 2012, 07:50:29)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
>>> print pandas.__version__
0.8.1
>>> print pandas.Panel(dict(a = None, b = pandas.DataFrame(index=[1,2,3],columns=[1,2,3])))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/pandas-0.8.1-py2.7-linux-x86_64.egg/pandas/core/panel.py", line 219, in __init__
    mgr = self._init_dict(data, passed_axes, dtype=dtype)
  File "/usr/local/lib/python2.7/site-packages/pandas-0.8.1-py2.7-linux-x86_64.egg/pandas/core/panel.py", line 256, in _init_dict
    major = _extract_axis(data, axis=0)
  File "/usr/local/lib/python2.7/site-packages/pandas-0.8.1-py2.7-linux-x86_64.egg/pandas/core/panel.py", line 1396, in _extract_axis
    raw_lengths.append(v.shape[axis])
AttributeError: 'NoneType' object has no attribute 'shape'

added tests and fixes for this case (and the pathological case of constructing with dict(a=None))
DOC: release notes. fix file modes