This is very useful!

However, it isn't fully baked.  Please test more
before submitting patches.  Try to break them on
corner cases.

import CallTips
CallTips.CallTips(

AttributeError: 'NoneType' object has no attribute 
'splitlines'

def foo():
    pass

foo(

same error.

There are two conditional blocks which need to go
on separate lines.

The jocular test in CallTipWindow needs to be changed
to avoid needless controversy.  Also, the doc window's
first line isn't quite right.

There may be other issues, but that's as far as I got.

I would like to get this into 2.6a1.  However, I
completely rewrote CallTips.py for 3.0.  I will need
another version of the patch for the latter, can you
supply it once we get 2.6 put to bed?