Benjamin, what would be involved in removing it? I suppose there's the module itself, some unit tests, and some docs. (I'm not asking you to remove it yet -- but I'm asking to look into the consequences, so that we can be sure to do the right thing before releasing 3.1 final.)
As Raymond and Gregory have pointed out in this thread, the library is quite independent as it stands now in the stlib, so should be trivial to remove. Nothing else should be affected.
Guido, have you made a firm decision to remove ipaddr.py from 3.1? The guys on IRC are chomping at the bit.